Free Online Tools for SEO, PDF, JSON, CSV and More

JSON Studio

Format, validate, minify, query and compare JSON in your browser, with precise line-and-column errors.

Regex Tester

Test patterns against sample text with match highlighting, capture groups and a safe one-second timeout.

CSV Cleaning Studio

Remove duplicates, fix missing values, standardise dates and export a clean CSV. Your file never leaves your device.

Chart Builder

Build charts from CSV data with aggregation, sorting and accessible colour palettes. Export as PNG or SVG.

Image Optimizer

Compress, resize, crop and convert up to 20 images at once, in your browser, with before-and-after sizes.

PDF Toolkit

Merge PDFs, extract or delete pages, rotate and reorder them — processed locally, never uploaded.

Structured Data Generator

Generate JSON-LD for Article, Product, FAQPage, LocalBusiness and more, with live validation against required properties.

Robots.txt and Sitemap Toolkit

A robots.txt rule builder with a URL tester and templates, plus an XML sitemap generator with validation.

UTM Campaign Builder

Create UTM-tagged URLs with validation, naming presets, bulk CSV mode and saved presets in your browser.

Pricing and Break-Even Simulator

Simulate price, profit, margin and break-even units with all fees included and every formula on display.

Content Analyzer

Analyse word counts, Flesch readability scores, long sentences and repeated phrases, with highlighted suggestions.

Text and Document Comparison

Diff two documents side by side or inline, with change navigation, summary counts and an exportable HTML report.

On-Page SEO and Redirect Checker

Enter a URL and get the full redirect chain, status, title and meta checks, heading outline, link counts and a prioritised fix list.

Security Header and DNS Checker

Check HSTS, CSP and other security headers, TLS details, and DNS/email authentication records (SPF, DKIM, DMARC).

QR Code Generator

Create QR codes for links, contacts, Wi-Fi and locations, with size and error-correction controls, and download as PNG, SVG or PDF.

Password Generator

Generate strong passwords with length and character-set controls, an honest entropy estimate and a session-only history.

Base64 Studio

Encode or decode Base64 text and files with URL-safe alphabet support and precise, positioned error messages.

Word Counter

Count words, characters, sentences and paragraphs, with reading and speaking times and one-to-three-word keyword density.

Add Page Numbers

Add "Page 2 of 3"-style numbers to a PDF in your browser, with six positions and a custom start count.

Add Watermark

Add a translucent text watermark to a PDF in your browser — opacity, angle, size and tiled layout controls.

Compare PDF

Diff two PDFs page by page at word level: counts of added, removed and unchanged words, similarity scores and highlighted changes.

Compress PDF

Compress a PDF in your browser: keep text with a lossless re-save, or go smallest with page images. Real byte counts shown.

Crop PDF

Crop PDF pages by setting margins in points or percent, in your browser. Honest note: a crop hides content, it does not delete it.

Edit PDF

Overlay text, rectangles, lines and images onto any page of a PDF, placed by clicking a live preview — processed in your browser.

Extract Pages

Extract pages like 3,1 or 1-3,5 from a PDF into one new file, in the order listed, processed in your browser.

Fill PDF Forms

Fill genuine AcroForm fields — text, checkboxes, dropdowns, radio groups and lists — with optional flattening, in your browser.

HTML to PDF

Paste an HTML snippet and download an A4 PDF of its rendered appearance. Scripts are stripped first; everything runs in your browser.

JPG to PDF

Combine up to 10 PNG, JPEG or WebP images into a single PDF with fit, A4 or Letter pages — built entirely in your browser.

Merge PDF

Combine up to 10 PDFs into a single document, in list order, entirely in your browser — nothing is uploaded.

OCR PDF

Make scanned PDFs searchable: OCR in your browser adds an invisible text layer so find, select and copy work.

Organize PDF

Reorder, rotate and delete PDF pages from a thumbnail grid, with drag and keyboard controls. Runs in your browser.

PDF to JPG

Turn each page of a PDF into a numbered JPG at your choice of DPI and quality — rendered entirely in your browser, zipped when there are several.

PDF to Markdown

Convert a PDF's text layer to Markdown — headings from type size, lists from markers, paragraphs from gaps — entirely in your browser.

Protect PDF

Password-protect a PDF with AES encryption and set print, copy and edit permissions — all in your browser.

Redact PDF

True redaction: pages with marked regions are rebuilt as images so covered text is removed, not hidden. Done in your browser.

Remove Pages

Remove pages like 2,4-6 from a PDF and keep the rest in order. Runs in your browser; removing every page is refused.

Repair PDF

Repair a structurally damaged PDF in your browser — broken cross-reference rebuilt, metadata kept, pages reported.

Rotate PDF

Rotate all pages or a chosen range by 90, 180 or 270 degrees, added to existing rotation. Runs in your browser.

Scan to PDF

Assemble up to 10 scanned or photographed pages into one PDF, with per-page rotation and a document-cleaning enhancement — all in your browser.

Sign PDF

Place a drawn, typed or uploaded signature on a PDF page and flatten it into the page content — processed entirely in your browser.

Split PDF

Split one PDF by ranges, every N pages, or page by page. Multi-part results arrive as one ZIP, built in your browser.

Unlock PDF

Remove password protection from a PDF you own — enter a password that opens it, get a clean unprotected copy.

Favicon Generator

Make a multi-layer ICO, PNG set, manifest and HTML snippet from an image or letter mark.

Barcode Label Maker

Create Code 39 and EAN barcodes and print label sheets at exact millimetre sizes.

Email Signature Generator

Create a professional email signature in table HTML with a plain-text version, in your browser.

Pomodoro Timer

Run focus sessions with short and long breaks, custom lengths and a session count.

Citation Generator

Create reference-list entries and in-text citations in APA 7th, MLA 9th and Chicago 17th styles.

Extractive Summarizer

Summarise pasted text extractively: top sentences by count or percentage, in original order.

Dictionary

Look up one English word at a time: meanings by part of speech, pronunciation and examples.

Basic Grammar Checker

Find repeated words, spacing slips, capitalisation slips and ten common typos in pasted text.

Business Card & Service Card Maker

Front-and-back cards in exact millimetres, with bleed and a safe margin, as PDF and 300 DPI PNG.

Logo Maker

Original geometric logo marks with wordmark and tagline, exported as SVG, PNG and vector PDF.

Luggage Tag Maker

Front-and-back luggage tags in exact millimetres, with a strap hole clear zone, as vector PDF and 300 DPI PNG.

Certificate Maker

Simple recognition certificates with a mandatory named issuer, as A4 or Letter PDF and 300 DPI PNG. No seals or verification wording.

CV Maker

A professional CV built section by section — experience, education, skills and CEFR language levels — as an A4 PDF.

Invoice & Quotation Builder

Invoices and quotations with line items, discounts and taxes, every formula shown, as A4 PDF or 300 DPI PNG.

Net Salary Calculator

A net pay estimate from gross pay and deductions you enter, per pay period, monthly and annual. Not a pay slip.

Letter Templates

Eight professional letter templates, filled in and edited by you, as A4 PDF or PNG. No employment-verification letters.

Passport Photo Maker

Passport-size photos at 300 DPI with a multi-copy print sheet, from your own photo, on your device. Not an official document.

Badge & Pass Designer

Event badges with a free-text role, designed in your browser, as PNG and vector PDF. No press mode or official seals.

Event Ticket Designer

Tickets for your own events, designed in your browser, as PNG and vector PDF. No transport, cinema, bank or government layouts.

Length Converter

Convert lengths between metric and imperial units and see the full table of equivalents.

Area Converter

Convert areas between metric and imperial units with a full table of equivalents.

Weight Converter

Convert weights between metric and imperial units with a full table of equivalents.

Volume Converter

Convert volumes between metric and imperial units with a full table of equivalents.

Data Size Converter

Convert data sizes in both decimal (1000-based) and binary (1024-based) units.

Time Converter

Convert durations between seconds, minutes, hours, days and weeks.

Percentage Calculator

Calculate percentages, percentage-of figures and percentage change with plain results.

Simple Interest Calculator

Work out simple interest and the total amount, year by year.

Compound Interest Calculator

Work out compound interest and watch the balance grow year by year.

Loan EMI Calculator

Work out a fixed-rate loan EMI, total interest and total payment.

Discount Calculator

Work out discount savings and sale prices either way round.

Tip Calculator

Work out a tip and split the bill fairly.

BMI Calculator

Work out BMI in metric or imperial units and see which WHO range it falls in.

Age Calculator

Work out an age precisely, to any reference date you choose.

Scientific Calculator

Calculate with powers, roots, trig in degrees, logs and factorials — no evaluation shortcuts.

Text Case Converter

Change text case for titles, code names and headings without retyping.

Duplicate Line Remover & Sorter

Remove duplicate lines and optionally sort what remains.

URL Encoder & Decoder

Encode URLs safely and read a URL's parts without visiting it.

Hash Generator

Hash text with SHA-1, SHA-256, SHA-384 or SHA-512 and compare fingerprints.

UUID & ULID Generator

Generate UUIDs and ULIDs for records, keys and test data.

Number Base Converter

Convert between binary, octal, decimal and hexadecimal without rounding.

Morse Code Translator

Translate between plain text and Morse code in both directions.

Colour Converter

Convert HEX, RGB and HSL colours and check contrast against white and black.

XML Formatter & Validator

Format, minify and validate XML without sending it anywhere.

Image Format Converter

Convert an image between common formats in your browser, with honest limits on formats the browser cannot produce.

API Pagination Test Data Builder

Generate a small paginated test dataset in your browser and preview offset and cursor pages, without calling any real API.

ASCII Converter

Convert text to decimal, hexadecimal and binary ASCII codes, or turn codes back into text, in your browser.

AsyncAPI Validator and Viewer

Validate an AsyncAPI document pasted as JSON and browse its channels and operations, in your browser.

Chmod Calculator

Convert Unix file permissions between symbolic form like rwxr-xr-x and octal form like 755, in your browser.

Cron Expression Generator

Build a five-field cron expression from minute, hour, day, month and weekday fields, with a plain-English reading.

Cron Expression Parser

Paste a five-field cron expression to read it in plain English and see its next run times, in your browser.

CSS Formatter and Beautifier

Paste messy CSS and get clean, indented, readable CSS back, in your browser.

CSS Z-Index Generator

List your page layers in stacking order and get spaced z-index values as CSS variables and classes.

CSV Data Quality Checker

Paste CSV data and get a quality report: row counts, missing values per column and duplicate rows.

CSV Duplicate Row Remover

Paste CSV data and remove duplicate rows, keeping the first copy of each row, in your browser.

CSV Join and Merge Planner

Join two CSV datasets on a shared column and preview inner and left joins, in your browser.

CSV Schema Profiler

Paste CSV data and get a column-by-column profile with guessed types, ranges and distinct counts.

CSV to iCloud Contacts VCF Converter

Convert a CSV contact list into a standard VCF file you can import into Contacts, in your browser.

CSV to JSON Converter

Convert CSV data into a JSON array of objects, one per row, in your browser.

CSV to SQL Converter

Convert CSV data into SQL CREATE TABLE and INSERT statements, with values safely quoted, in your browser.

CSV to TSV Converter

Convert CSV data to tab-separated (TSV) data, handling quoted commas and tabs in values.

CSV to XLSX Converter

Convert CSV data into a downloadable XLSX spreadsheet file, built in your browser with no library.

CSV Viewer and Editor

Paste CSV data, view it as an editable table, add rows and columns, and export it back to CSV.

Data Mapping Transformer

Paste a JSON array of records and mapping rules, and get reshaped records back, in your browser.

Docker Compose Visualizer

Paste a Docker Compose file in JSON or a simple YAML shape and see its services and dependencies.

Dockerfile Optimizer

Paste a Dockerfile and get a list of concrete size and practice fixes, in your browser.

DOCX Metadata Cleaner

Upload a DOCX file and download a copy with author, editor, company and custom-property metadata removed.

DOCX Word Count Analyzer

Upload a DOCX file and count its words, paragraphs, characters and reading time, in your browser.

Flatten PDF Forms

Flatten a PDF form in your browser: list its fillable fields, then download a copy with the values baked into the pages.

GraphQL Mock Data Generator

Paste a GraphQL schema and get placeholder JSON in its shape, with deterministic values for every field.

GraphQL Query Complexity Estimator

Paste a GraphQL query and get a complexity score with a per-field breakdown, using the rule stated on the page.

Grayscale PDF Converter

Convert a PDF to greyscale in your browser. Pages are rendered and rebuilt as image pages; text is no longer selectable.

HTML Formatter and Beautifier

Format HTML in your browser: every element on its own line, indented two spaces per level of nesting.

HTTP Request to Code Converter

Paste a curl command or raw HTTP request and get the same request as JavaScript fetch, Python requests and curl code.

iCloud Backup Time Calculator

Enter a backup size and upload speed to estimate transfer time. Uses only numbers you type; it reads no account.

iCloud Calendar Duplicate Cleaner

Paste or upload .ics calendar text and get a cleaned copy with duplicate events removed. Works on your data only.

iCloud Calendar ICS Merger

Paste or upload two .ics calendars and get one merged calendar with duplicates dropped. Works on your data only.

iCloud Calendar ICS to CSV Converter

Paste or upload .ics calendar text and convert every event to a CSV row. Works on your data only.

iCloud Calendar ICS Viewer

Paste or upload .ics calendar text and view its events in a table, earliest first. Works on your data only.

iCloud Contacts Duplicate Cleaner

Paste or upload .vcf contacts and get a cleaned copy with duplicates removed. Works on your data only.

iCloud Contacts VCF to CSV Converter

Paste or upload .vcf contacts and convert each one to a CSV row. Works on your data only.

iCloud Contacts VCF Viewer

Paste or upload .vcf contacts and view them in a table sorted by name. Works on your data only.

iCloud Duplicate Photo Finder

Choose image files and group exact duplicates by content hash, in your browser. Similar-looking photos are not flagged.

iCloud Export Folder Analyzer

Choose files or a folder and get counts, sizes by type, top extensions and the largest file, in your browser.

iCloud Photo Date Organizer

Choose image files and get a year/month folder plan from each photo's taken date or file date, in your browser.

iCloud Photos Storage Calculator

Enter photo and video counts and average sizes to estimate total storage against a plan. Numbers you type only.

iCloud Storage Calculator

Enter storage by category in GB and compare the total with a plan size, in your browser. Numbers you type only.

iCloud Storage Cleanup Planner

Enter category sizes and removable shares to build a ranked cleanup plan. A plan only; it deletes nothing.

iPhone Photo Metadata Viewer

Choose image files and view their dimensions, size, type and modification date, in your browser. No uploads.

JavaScript Formatter and Beautifier

Format JavaScript in your browser: re-indented two spaces per level, with for-loop headers kept on one line.

JSON Escape and Unescape

Escape plain text into a JSON string literal or unescape a literal back to text, in your browser.

JSON Schema Inferrer

Paste a JSON document and get an inferred JSON Schema describing its types and structure, in your browser.

JSON Schema Sample Generator

Paste a JSON Schema and get a sample document that follows it — types, required fields, enums and examples honoured.

JSON Schema Validator

Validate JSON against a schema with clear, located error messages — types, required fields, ranges, patterns and enums.

JSON Table Explorer

Paste JSON data and explore it as a table — search every cell, sort any column, and download the filtered rows as CSV.

JSON to CSV Converter

Turn JSON into spreadsheet-ready CSV: nested objects become dot-separated columns and arrays are joined safely.

JSON to YAML Converter

Paste JSON and get clean YAML back — nested objects, arrays and quoted strings handled, ready to paste into configs.

JSONPath Tester

Test JSONPath queries against your data — child, wildcard, recursive descent, index, slice and simple filters supported.

JWT Decoder

Paste a JSON Web Token to read its header and claims, see expiry in plain language, and check which algorithm it names.

Markdown Editor and Preview

A side-by-side Markdown editor with live preview — headings, lists, links, code and tables, rendered as you type.

Markdown Table Generator

Type column names and rows, pick alignment per column, and get a clean Markdown table plus an HTML preview.

Markdown to DOCX Converter

Paste Markdown and download a real .docx file — headings, paragraphs, bold, lists and code, built locally as a Word document.

OpenAPI Mock Data Generator

Paste an OpenAPI document or a schema and get mock JSON that follows it — types, enums, formats and nested objects included.

OpenAPI Specification Diff Checker

Paste two OpenAPI specs (JSON, or simple YAML) and see exactly which paths, operations and responses changed.

PDF Accessibility Checker

Upload a PDF and get an accessibility report — document title, language, tagged structure, embedded fonts and text availability.

PDF Font Inspector

Upload a PDF to see all its fonts — name, subtype, encoding and embedding status — without uploading the file anywhere.

PDF Form Field Inspector

Upload a PDF form and see all its fields: text, checkbox, radio, choice and signature fields, with names and values.

PDF Metadata Viewer and Editor

Read PDF metadata in your browser, edit title, author, subject and keywords, and download an updated copy of the file.

PDF OCR Quality Checker

Upload a PDF and get a text-extraction quality report: characters per page, image count and a scanned-vs-text verdict.

PDF Page Size Converter

Upload a PDF, pick a target page size, and download a copy with every page resized and its content scaled to fit proportionally.

Pdf to word

Upload a text-based PDF and download its text as a real .docx file — no layout promises, just clean, editable text.

Protobuf Schema Viewer

Read Protocol Buffer schemas without a compiler — messages with field numbers and types, enums and service RPCs, laid out clearly.

Query String Builder

Type parameters line by line and get a properly encoded URL query string — plus a parser that reads one back into a table.

Spreadsheet Column Profiler

Paste CSV data and get a column-by-column profile — counts, distinct values, numeric ranges and averages, and the most common entries.

Spreadsheet Duplicate Finder

Paste CSV, pick the key columns (or all of them), and see every duplicate group plus a clean deduplicated CSV to copy.

SQL Explain Plan Visualizer

Turn a plain-text EXPLAIN plan into a readable cost-and-rows table, with the most expensive operation highlighted.

SQL Formatter

Tidy messy SQL: keywords upper-cased, major clauses on their own lines, commas kept readable.

SQL Index Advisor

Read a SELECT query's WHERE, JOIN and ORDER BY columns and suggest practical indexes to consider.

SQL Schema Diff Checker

Paste two table definitions side by side and get a clear added, removed and changed column list.

TSV to CSV Converter

Paste TSV, get clean CSV: fields containing commas or quotes are quoted correctly.

Unix Timestamp Converter

Unix time to UTC date and back: seconds, milliseconds, and ISO dates in one place.

URL Parser

Paste any URL and see its parts laid out: scheme, host, port, path, query pairs and fragment.

VCF Merge and Split Tool

Paste or load .vcf text: merge contacts into one list or split them apart, one card at a time.

XLSX Formula Inspector

Inspect a spreadsheet you upload: every formula cell listed with its formula and stored value.

XLSX to CSV Converter

Turn sheet XML rows into CSV: shared-string cells resolved, values quoted correctly.

YAML Formatter and Validator

Check YAML structure and reformat it with consistent two-space indentation — for the common subset.

YAML to JSON Converter

YAML in, JSON out: simple mappings and lists converted with numbers and booleans typed correctly.

Z-Axis Rotation Calculator

Rotate (x, y) about the origin by degrees: the new coordinates, with the rotation formula shown.

Z-Order (Morton Code) Calculator

Encode (x, y) as a Z-order Morton code by bit interleaving, or decode a code back to its pair.

Academic Reading Time Calculator

Paste academic text, pick a reading level, and get a realistic reading-time estimate.

Acceleration Calculator

Acceleration = (final velocity − initial velocity) ÷ time, with distance from the same inputs.

Acronym Extractor

Scan text for capital-letter acronyms and capture their expanded forms where given.

Action Item Tracker

Add action items with an owner and due date, tick them done, and see open vs done counts.

AI Token Counter

Approximate token estimate for pasted text, with the method stated and a range, not a fake exact count.

Alphabetical Order Sorter

Paste lines, sort them alphabetically, and optionally drop duplicates.

Anagram Solver

Enter letters and candidate words: the tool lists the exact anagrams among them.

Angle Converter

One angle in every unit: degrees, radians, gradians and turns side by side.

Antilog and Logarithm Calculator

Log and antilog in bases 10, e and 2: log(x) one way, base raised to a power the other.

Area Calculator

Area from shapes and dimensions — not unit conversion. Rectangle, circle, triangle and more, with formulas shown.

Arithmetic Sequence Calculator

Enter the first term, the common difference and how many terms you want, and get the nth term, the sum and the whole sequence.

ASCII Art Text Generator

Type a word or short phrase and get it drawn as large block letters made from plain text characters, ready to copy anywhere.

Attendance Percentage Calculator

Enter classes attended and classes held to get your attendance percentage, plus how many more classes you need for a target.

Average Calculator

Paste a list of numbers and get the mean, median, mode, range, count and sum, with the sorted list shown for checking.

Bass Guitar Tuner

Play a reference tone for each bass string in standard tuning (E1, A1, D2, G2) and tune by ear. No microphone tuning is offered here.

Bibliography Deduplicator

Paste a list of references, one per line, and get a clean list with exact and near duplicates removed, plus a count of what was dropped.

Chord Progression Generator

Pick a major key and a classic progression pattern to get the chords with their notes, ready for songwriting practice.

Citation Coverage Checker

Paste a draft and see what share of its sentences contain a citation, with the uncited sentences listed for review.

Citation Formatter

Enter author, year, title and source to get the same reference formatted in APA, MLA and Chicago styles for checking.

Content Calendar Builder

Enter a start date, posts per week and your topics to build a dated content calendar table you can copy.

Context Window Planner

Enter a model's context size, your prompt, system text and output reserve to see remaining tokens and an estimated word budget.

Contract Maker

Pick a simple agreement template, fill in the parties and terms, and get a plain-text draft to copy or download. Not legal advice.

CPM, CPC and CPA Calculator

Enter ad spend, impressions, clicks and conversions to get CPM, CPC, CPA and click-through rate in one calculation.

CSS Animation Generator

Pick an animation, duration and timing, preview it on a box, and copy the CSS keyframes and class for your own site.

CSS Border Radius Generator

Set each corner radius, preview the rounded box, and copy the border-radius CSS for your own stylesheet.

CSS Box Shadow Generator

Set shadow offsets, blur, spread, colour and opacity, preview the shadow, and copy the box-shadow CSS.

CSS Clamp Calculator

Enter minimum and maximum sizes and viewport widths to get a fluid clamp() value for responsive text.

CSS Gradient Generator

Pick gradient type, angle and colours, preview the result, and copy the background CSS for your own site.

CSS Grid Generator

Set grid columns, rows and gap, preview the cell layout, and copy the CSS grid code for your own stylesheet.

CSS Specificity Calculator

Type a CSS selector to get its specificity as IDs, classes and elements, plus the comparison score.

CSS Transform Generator

Set translate, rotate, scale and skew values, preview the transformed box, and copy the transform CSS.

Customer Support Email Writer

Pick a support situation, fill in the customer, order and issue details, and get a polite email draft to copy or download.

Decimal to Fraction Converter

Enter a decimal number and get its simplified fraction, shown as a proper, improper or mixed number where it fits.

Density Calculator

Solve for density, mass or volume: enter any two values and get the third, with the formula shown.

Design Token Converter

Enter a hex colour and a pixel size to get its RGB values, its rem size, and a ready-to-paste CSS variable.

Desk Ergonomics Checker

Enter your height, desk height and screen position for a plain general checklist of desk height and screen placement.

DPI Calculator

Enter a width in pixels and the same width in inches to get the dots-per-inch value for screens and print.

Ear Training

Pick a note to hear a reference tone in your browser and see its frequency, for practising note recognition by ear.

Editorial Style Guide Checker

Paste a draft to count double spaces, sentences over 25 words, repeated words and uses of very, in your browser.

Email Deliverability Preflight Checker

Enter an email address for local format and pattern checks only, with a plain warning that this is not a deliverability guarantee.

Email Preheader Preview Builder

Type a subject line and preheader to see the combined preview trimmed to mobile and desktop inbox lengths.

Email Reply Writer

Enter who you are replying to, the topic, a tone and your key points to get a fill-in reply draft to check before sending.

Email Response-Time Calculator

Enter how many emails were answered, how many met your target time and the total reply hours to get the average and target share.

Email Subject Line Tester

Type a subject line to get a score out of 100 based on its length, word count, capitalisation and spam-style words.

Embedding Similarity Explorer

Paste two lists of numbers of the same length to get their cosine similarity, a value from -1 to 1, in your browser.

Employee Break-Time Calculator

Enter a shift length and total break minutes to get net work time and the share of the shift spent on break.

Exam Revision Planner

Enter how many topics you have, how many days are left and your daily study hours to get topics per day and time per topic.

Expense Reimbursement Calculator

Enter expense amounts plus miles travelled and a per-mile rate to get the expense total, mileage total and combined claim total.

Feedback Request Email Writer

Enter a recipient, a product or service and one clear question to get a short feedback-request draft to check before sending.

Filler Word and Cliché Detector

Paste a draft to count common filler words and a small list of tired phrases, so you can tighten the wording.

Flashcard Maker

Type one term and definition per line, separated by ::, to get a set of flashcards you can step through and copy.

Flexbox Playground

Choose flex direction, justification, alignment and gap to see a live preview of boxes and the matching CSS snippet.

Fluid Typography Calculator

Enter a minimum and maximum font size with a viewport range to get the clamp() formula for fluid type.

Follow-up Email Writer

Enter a recipient, the original topic, days waited and your ask to get a short follow-up draft to check before sending.

Function Calling Schema Builder

Enter a function name, description and parameters as name:type:yes lines to get a JSON schema for function calling.

Glossary Builder

Type one term and definition per line, separated by ::, to get an alphabetically sorted glossary you can copy.

Guitar Capo Calculator

Enter a chord shape and a capo fret to find the chord that actually sounds, by shifting the root up by the capo fret.

Guitar Chord Finder

Choose a root note and major or minor to see the three notes of the triad, for checking chord shapes.

Guitar Chord Transposer

Paste a chord chart, choose how many semitones to shift, and get every chord transposed with the same chord qualities kept.

Guitar Tuner

Pick a string and hear its reference tone, with its note name and frequency shown, so you can tune by ear.

Hallucination Claim Extractor

Paste text and get its checkable claims listed separately from opinions, so you can check each claim yourself against a reliable source.

Headline Score Analyzer

Type a headline and get a heuristic score out of 100 with the reasons shown, so you can see exactly what raised or lowered it.

HTML Email Compatibility Checker

Paste email HTML and get a list of risky patterns, such as scripts, external stylesheets and forms, with a simple compatibility score.

Hypothesis Test Selector

Answer three questions about your data type, groups and normality, and get the matching statistical test with a plain explanation.

Idea Generator

Type a topic and get a deterministic list of idea starters built from that topic, ready to develop further.

Influencer Campaign Cost Calculator

Enter followers, engagement rate, post count and rate per post to estimate reach, total cost and cost per engagement.

Introduction Email Writer

Fill in your name, the recipient and your purpose, and get a polite introduction email draft to review before sending.

Invitation Email Writer

Fill in the event, date, time and venue, and get a clear invitation email draft to review before sending.

Invoice Due-Date Calculator

Enter an invoice date and payment terms in days, and get the due date, with the number of days shown.

Keyword Density Checker

Paste text and a keyword to get its count, total word count and density percentage.

Lead Scoring Calculator

Rate a lead from 0 to 25 on budget, authority, need and timeline, and get a total score out of 100 with a Hot, Warm or Cold grade.

Lecture Notes Outline Builder

Type a lecture topic and get a structured outline with introduction, key concepts, examples, summary and questions.

Literature Review Matrix Builder

Enter one paper per line as author, year and finding, separated by pipes, and get a comparison table you can copy.

LLM API Cost Calculator

Enter input and output token counts plus prices per million tokens, and get the estimated cost split by input and output.

LLM Batch Request Builder

Enter one prompt per line and get a numbered JSON array of batch requests, ready to copy into your own workflow.

LLM Evaluation Rubric Builder

Type what you are evaluating and get a rubric table for accuracy, relevance and clarity, each scored from 1 to 4.

Marketing Budget Allocator

Enter a total budget and percentage shares for four channels, and get the amount for each channel, with the shares checked to 100.

Marks Percentage Calculator

Enter marks obtained and total marks to get the percentage, with a simple grade band shown.

Matrix Calculator

Enter two matrices as rows of comma-separated numbers and get their sum or product, with size errors explained.

MCP Capability Inspector

Paste a JSON description listing tools, resources and prompts, and get counts and a field checklist, all checked locally.

MCP Server Configuration Builder

Enter a server name, command and arguments, and get a JSON configuration snippet to copy into your own config file.

Meeting Minutes Builder

Enter the date, attendees, decisions and action items, and get cleanly formatted meeting minutes to copy.

Meme Generator

Type a top and bottom caption and place it on a plain coloured canvas or on an image you upload from your device.

Midpoint Calculator

Enter two points and get their midpoint plus the straight-line distance between them, with the working shown.

Mileage Reimbursement Calculator

Enter miles driven and a per-mile rate to get the reimbursement amount, with the multiplication shown.

Mirror Text Generator

Type text and get a mirrored version with letters flipped, ready to copy into a post or message.

Modulo Calculator

Enter a dividend and a divisor to get the remainder, with the division shown.

Molar Mass Calculator

Type a chemical formula from common elements and get its molar mass with each element's contribution shown.

Multi-Model Response Comparator

Paste two responses and compare their lengths and your own manual scores side by side, with a simple verdict.

Multiplication Table Generator

Enter a number and how far the table should go to get every multiplication fact in order.

Note Frequency Calculator

Pick a note and octave to get its frequency in hertz under equal temperament with A4 at 440 Hz.

Online Instrument Tuner

Pick a note and play its reference tone, then tune your instrument by ear to match it.

Online Metronome

Enter a tempo in beats per minute and beats per bar, then start steady clicks in your browser.

OpenAI / Anthropic / Gemini Request Converter

Enter a model name, prompt, token limit and temperature to see the same request written in three provider formats.

Passive Voice Detector

Paste text and highlight likely passive constructions, where a form of be is followed by a past participle.

Petty Cash Tracker

Enter an opening float and one expense per line to see total spent and cash remaining.

Piano Note Checker

Pick a note and octave to hear its reference tone and see its frequency and note number.

Plain Language Analyzer

Paste text to see word and sentence counts, average sentence length, and long-word share.

Promotional Email Writer

Enter the product, audience, benefit and call to action to get a fill-in email draft to edit before sending.

Prompt Template Builder

Enter the task, audience, tone and output format to get a structured prompt you can copy and edit.

Prompt Version Diff Checker

Paste two versions of a prompt to see added words, removed words and words kept in both.

Purchase Order Number Generator

Enter a prefix, year, starting number and count to get a run of sequential order numbers.

RAG Chunking Simulator

Enter text, a chunk size in characters and an overlap to see the chunks a splitter would produce.

Readability Score Analyzer

Paste text to get its Flesch Reading Ease score and Flesch-Kincaid grade level, with counts shown.

Research Question Builder

Enter a topic, population and outcome to get a main research question plus two variants to edit.

Research Sample Size Calculator

Pick a confidence level, margin of error and expected proportion, plus an optional population size, to get the sample size.

ROAS Calculator

Enter your revenue and ad spend to get ROAS and ROI from your own numbers, with the working shown.

Scale Trainer

Pick a root note and a scale type to see its notes and frequencies, and play reference tones in your browser.

Scientific Notation Converter

Convert a plain number to scientific notation, or a mantissa and exponent back to a plain number.

Sentence Length Analyzer

Paste text to get sentence count, average words per sentence, and your longest sentence for plain-language editing.

Significant Figures Calculator

Enter a number and how many significant figures you want, and get the rounded result with its place value explained.

Slope Calculator

Enter two points to get the slope, the line equation and the distance between them, with vertical lines handled.

Social Media Engagement Rate Calculator

Enter likes, comments, shares and follower count to get the engagement rate, with the formula shown.

Speech Time Calculator

Paste a speech or enter a word count, pick a speaking pace, and get the estimated speaking time in minutes and seconds.

Speed Distance Time Calculator

Enter any two of speed, distance and time to calculate the third, with the formula used shown.

Square Root Calculator

Enter a number to get its square root, and see whether it is a perfect square, with the check shown.

SRT Subtitle Validator

Paste SRT subtitle text to check block numbering, timestamp format, ordering and overlaps, with each problem listed.

Standard Deviation Calculator

Enter a list of numbers to get the mean and both population and sample standard deviation, with the list sorted for checking.

Statistical Power Calculator

Enter an effect size, sample size per group and significance level for a normal-approximation power estimate, clearly marked as an estimate.

Structured Output Schema Builder

List fields as name, type and required flag to build a JSON schema object you can copy into your own tooling.

Study Timetable Planner

Enter subjects with hours needed, plus days and hours per day, to get a day-by-day study plan you can follow.

Subtitle Line Break Formatter

Paste subtitle text and a maximum line length to get cleanly wrapped lines that keep every word in order.

Subtitle Reading Speed Checker

Enter subtitle text and its on-screen duration to get characters per second and a plain reading-speed verdict.

Surface Area Calculator

Pick a shape and enter its dimensions to get the surface area, with the formula for that shape shown.

SVG Data URI Converter

Paste SVG markup to get a data URI you can use inline, or paste a data URI back to recover the SVG code.

SVG Icon Sprite Generator

List icons as name and inner SVG markup per line to build a single inline sprite with one symbol per icon.

SVG Path Optimizer

Paste an SVG path to round its coordinates to two decimals and clean up spacing, without changing the path shape.

System Prompt Linter

Paste a system prompt to check it against a static checklist for role, task, constraints and format, with a score and gaps listed.

Tailwind Class Converter

Enter utility class names to get the matching plain CSS for the documented mapping subset, with unmapped classes passed through.

Tap Tempo

Tap the beat button in time to get the tempo in beats per minute, with tap count and average gap shown.

Task Time Estimator

Enter optimistic, most likely and pessimistic durations and get a PERT expected time, standard deviation and likely range.

Text Expansion

Paste text full of abbreviations and expand FYI, ETA, TBD, ASAP and more into plain full words you can copy out.

Text Shorten

Paste a paragraph and keep only its most informative sentences, chosen by word frequency. Extractive shortening, not AI summarising.

Title Generator

Enter a topic keyword, pick a title style, and get a list of ready-to-adapt title ideas for articles and posts.

Tone Generator

Type a sentence and rewrite it in a formal, friendly, confident or apologetic tone with simple, transparent word swaps.

Translation Cost Calculator

Enter the word count, your per-word rate and a minimum fee to estimate a translation job's cost from your own rates.

Ukulele Tuner

Play a reference tone for each ukulele string in standard tuning and tune by ear. Reference tones only.

Unicode Script Detector

Paste text and see how many characters belong to Latin, Cyrillic, Greek, Arabic, Han and other scripts, with a per-script count.

Vector Database Storage Calculator

Enter vector count, dimensions, numeric precision and index overhead to estimate raw vector storage in bytes, GB and GiB.

Vendor Evaluation Scorecard

Score a vendor on price, quality, delivery and support with your own weights and get a weighted score out of 10 plus a rating.

Vendor Quotation Comparator

Enter two vendors' prices, delivery times and warranty lengths to see the cheapest quote, the fastest delivery and the price gap.

Violin Tuner

Play a reference tone for each violin string in standard tuning and tune by ear. Reference tones only.

Work-From-Home Expense Tracker

List monthly home-office costs as label and amount lines and get the monthly total, the annual total and each item's share.

Writing Tone Analyzer

Paste text and get a transparent heuristic tone read: counts of positive, negative, formal, informal and uncertain words with a dominant tone.

YouTube Chapter Generator

Paste a chapter outline, one chapter per line, and build a timestamp list with a start time and minutes per chapter. No video is read.

YouTube Title Analyzer

Paste a video title and get a transparent heuristic score from length, numbers, power words and questions, with every point explained.

Z-Score to Percentile and P-Value Calculator

Enter a z-score and get its percentile, one-tailed p-value and two-tailed p-value from the standard normal distribution.

Z-Test Calculator

Enter a sample mean, population mean, population standard deviation and sample size to get the z-statistic and two-tailed p-value.

4-20 mA Scaling Calculator

Convert a 4-20 mA loop current to an engineering value between your chosen minimum and maximum, or convert back the other way.

555 Timer Calculator

Enter R1, R2 and C for an astable 555 timer and get its frequency, duty cycle and period from the standard formulas.

A/B Test Sample Size Calculator

Enter a baseline conversion rate and the minimum detectable effect to get the sample size per variant for a two-sided test.

A/B Test Significance Calculator

Enter visitors and conversions for variants A and B to get conversion rates, the z-statistic, the two-tailed p-value and a plain verdict.

Acreage Calculator

Enter a plot's length and width in feet to get its area in square feet, acres and hectares, or enter square feet directly.

ADC Resolution Calculator

Enter an ADC's bit count and reference voltage to get its step size in volts and millivolts, its level count and its maximum code.

Age Difference Calculator

Enter two dates and get the exact difference in years, months and days, plus the total days between them.

Air Conditioner Tonnage Calculator

Enter a room area and get an estimated cooling load in BTU per hour and air conditioner size in tons.

Air Fryer Conversion Calculator

Enter an oven temperature and time and get the usual air fryer equivalents: 25 degrees lower and 20 percent less time.

Alarm Clock Online

Pick an alarm time and see how long until it arrives, with a live countdown that runs while this tab stays open.

Alcohol BAC Calculator

Enter weight, sex, standard drinks and hours since drinking for a Widmark BAC estimate. Not a legal or safety determination.

Amortization Schedule Calculator

Enter a loan amount, annual rate and term to get the monthly payment, total paid and total interest, plus the first payment split.

Anniversary Calculator

Enter a start date and a reference date to see completed years, the next anniversary date and days until it.

Annuity Calculator

Enter a monthly payment, annual rate and years to get the future value of an ordinary annuity and the interest earned.

APR Calculator

Enter a loan amount, monthly payment and number of months to solve for the implied annual percentage rate.

Aquarium Volume Calculator

Enter a rectangular tank's length, width and height in centimetres to get its volume in litres and US gallons.

Australia BSB Code Finder

Type a BSB code to check its six-digit format and see it written as XXX-XXX. No bank database lookup is involved.

Auto Loan Calculator

Enter a vehicle price, deposit, annual rate and term to get the loan amount, monthly payment and total interest.

Bank Account Masker

Paste text containing a number and mask all but its last four digits, entirely in your browser.

Battery Backup Runtime Calculator

Enter battery capacity, voltage, load and efficiency to estimate backup runtime in hours and minutes.

Battery Series-Parallel Calculator

Enter one cell's voltage and capacity plus series and parallel counts to get total voltage, capacity and energy.

BMR Calculator

Enter weight, height, age and sex to estimate basal metabolic rate in calories per day. An estimate, not a measurement.

Body Fat Percentage Calculator

Enter height, neck, waist and hip measurements for a US Navy body fat estimate. An estimate, not a measurement.

Bond Yield Calculator

Enter face value, annual coupon, price and years to maturity for current yield and an approximate yield to maturity.

Brick Quantity Calculator

Enter wall length and height to estimate bricks needed at 50 per square metre, plus a 10 percent waste allowance.

Business Days Calculator

Enter a start and end date to count Monday-to-Friday days between them, inclusive of both dates.

CAGR Calculator

Enter a start value, end value and number of years to get the compound annual growth rate.

Calibration Due-Date Calculator

Enter the last calibration date and interval in months to get the next due date.

Calorie Deficit Calculator

Enter weight, height, age, sex, activity level and a daily deficit to get an estimated maintenance level and calorie target.

Canada Bank Transit Number Validator

Enter a 5-digit transit number and 3-digit institution number to check the format and build the 9-digit routing number.

Capacitor Code Calculator

Enter a 3-digit capacitor code and read its value in picofarads, nanofarads and microfarads, with the decoding shown step by step.

Cement and Sand Ratio Calculator

Enter a cement-to-sand ratio and a mortar volume to get the cement in kilograms and bags plus the sand volume, using a standard dry-volume factor.

Churn Revenue Impact Calculator

Enter monthly recurring revenue and a monthly churn rate to see revenue lost each month and year, and the revenue that remains.

Circuit Breaker Size Calculator

Enter a load in watts and a supply voltage to get the load current, the 1.25 safety-factor current and the next standard breaker size.

Cohort Retention Analyzer

Enter a starting cohort size and how many remain after each period to see the retention percentage for every period.

Credit Card Luhn Validator

Enter a number to run the Luhn check-digit test. This checks the format only and never verifies a real card or account.

Credit Card Payoff Calculator

Enter a card balance, annual rate and fixed monthly payment to see the months to clear it, total interest and total paid.

Daily Water Intake Calculator

Enter body weight to get a general daily water estimate at about 35 ml per kilogram, in millilitres and litres.

Date Calculator

Pick a start date, choose add or subtract, and enter a number of days to get the resulting calendar date.

Date Countdown Timer

Enter a start date and a target date to see the countdown in days, weeks and days, and total hours.

Day of the Week Calculator

Enter a date and find which weekday it falls on, using the standard Gregorian calendar.

Days Between Dates

Enter two dates to see the number of days between them, plus the same gap in weeks and days.

Debt Avalanche Calculator

Enter two debts and a monthly budget to see the avalanche order, highest rate first, with months to clear both and total interest.

Debt Snowball Calculator

Enter two debts and a monthly budget to see the snowball order, smallest balance first, with months to clear both and total interest.

Debt-to-Income Ratio Calculator

Enter total monthly debt payments and gross monthly income to get your debt-to-income ratio as a percentage.

Decibel Converter

Enter a ratio and choose power or amplitude to get the level in decibels, using the standard log formulas.

Decision Wheel Spinner

List options one per line and spin: the tool picks one at random using the browser's random number generator.

Depreciation Calculator

Enter cost, salvage value and useful life, then choose straight-line or double-declining to see the yearly charge and book value.

Dew Point Calculator

Enter air temperature in Celsius and relative humidity to get the dew point in Celsius from the Magnus formula.

Dice Roller

Choose how many dice and how many sides, then roll: the tool uses the browser's random number generator and shows each die and the total.

Digital Clock

Start a live clock in 12-hour or 24-hour format, shown in your browser only from your device's own time.

Dimensional Weight Calculator

Enter length, width, height, a divisor and the actual weight to get dimensional weight and the higher billable weight.

Discounted Cash Flow (DCF) Calculator

Enter an initial investment, an equal yearly cash flow, the number of years and a discount rate to get present value and net present value.

Dividend Yield Calculator

Enter the annual dividend per share, the share price and shares held to get the yield percentage and yearly dividend income.

Document Expiry Planner

Enter a document expiry date and a reminder lead time to see the days remaining and the date to act by.

Dog Age Calculator

Enter a dog's age and size to estimate its age in human years using a stated size-based approximation.

Dog Food Calculator

Enter a dog's weight, activity level and food energy to estimate daily calories and cups of food.

Down Payment Calculator

Enter a purchase price, down payment percentage and closing cost percentage to see the down payment, loan and total cash needed.

Drywall Calculator

Enter wall length and height, sheet size and a waste percentage to estimate how many drywall sheets to buy.

Earthing Conductor Size Calculator

Enter fault current, fault duration and a k factor to estimate the minimum earthing conductor cross-section and the next standard size.

Economic Order Quantity Calculator

Enter annual demand, cost per order and holding cost per unit to get the economic order quantity, orders per year and relevant cost.

Electrical Busbar Size Calculator

Enter load current, current density and bar thickness to estimate busbar cross-section and the width needed.

Electrical Cable Size Calculator

Enter cable length, load current and allowed voltage drop to estimate the minimum cable cross-section and the next standard size.

Electrical Conduit Fill Calculator

Enter conduit internal diameter, cable diameter and cable count to see conduit fill percentage against a 40% guide limit.

Electrical Demand Factor Calculator

Enter total connected load and a demand factor to get the demand load and the demand current at a chosen voltage.

Electrical Fuse Size Calculator

Enter load current and a sizing factor to get the calculated fuse current and the next standard fuse size.

Electrical Inspection Checklist Builder

Pick an inspection scope to build a checklist of items to check, with a count you can work through on site.

Electrical Load Schedule Builder

Type load lines as label and watts, plus a demand factor and voltage, to get total load, demand load and current.

Electricity Cost Calculator

Enter appliance power, hours per day, days and the price per kWh to get energy used and total electricity cost.

Employee Cost Calculator

Enter annual salary, benefits percentage and other annual costs to get the total yearly and monthly cost of an employee.

Equipment Downtime Calculator

Enter total planned time and downtime to get uptime, availability percentage and downtime percentage.

Fixed deposit Calculator

Enter deposit amount, annual interest rate and years to get the maturity value and interest earned with yearly compounding.

Flooring Material Calculator

Enter room length and width, box coverage and a waste percentage to estimate flooring area and boxes to buy.

Freelance Hourly Rate Calculator

Enter desired annual income, annual business expenses and billable hours to get the hourly rate that covers both.

Fuel Cost Calculator

Enter trip distance, fuel consumption and price to get fuel used and total fuel cost, in miles per gallon or litres per 100 km.

Funnel Conversion Analyzer

Enter visitors, signups and purchases to get step conversion rates and the overall conversion rate of a funnel.

Future Value Calculator

Enter a present amount, annual rate and years to get its future value and the growth over the period.

Generator Fuel Consumption Calculator

Enter generator load, fuel use per kWh, run hours and fuel price to get hourly use, total fuel and total cost.

Generator Size Calculator

Estimate the generator size in watts and kilowatts from entered loads, with a safety margin.

GST Calculator

Add or strip GST from an amount at any rate and see the GST amount and total.

Half-Life Calculator

Calculate remaining quantity from an initial amount, elapsed time and half-life.

Heart Rate Zone Calculator

Estimate maximum heart rate as 220 minus age and show five training zones.

Home Energy Usage Estimator

Estimate monthly kilowatt-hours and cost from watts, daily hours and your rate.

IBAN Format Guide

See how an IBAN is structured: country, check digits and national account parts.

IBAN Validator

Validate an IBAN with the mod-97 check and a country-length format check.

ICE Scoring Calculator

Score an idea from 1 to 10 on Impact, Confidence and Ease and rank it by average and product.

Ideal Weight Calculator

Estimate a statistical ideal weight range from height using the Devine formula.

India IFSC Code Finder

Validate the 11-character IFSC format and break it into bank and branch parts.

India MICR Code Finder

Validate the 9-digit MICR format and break it into city, bank and branch parts.

Inductor Color Code Calculator

Convert colour-band digits and multiplier into inductance in microhenries and millihenries.

Inflation Impact Calculator

Calculate the future cost of an amount and what today's money will be worth, at an inflation rate.

International Bank Holiday Finder

Count working days in a date range, excluding weekends and holiday dates you enter yourself.

Interview Question Practice Generator

Generate a set of practice interview questions from built-in lists by topic and count.

Inventory Reorder Point Calculator

Calculate the reorder point from daily demand, lead time and safety stock.

Inverter Size Calculator

Estimate inverter size from load watts, power factor and a safety margin.

Investment Fee Impact Calculator

Compare growth with and without an annual fee over a number of years.

IRR Calculator

Solve for the discount rate that makes the net present value of cash flows zero.

LC Resonance Calculator

Calculate resonant frequency from inductance and capacitance using 1 over 2 pi root LC.

Leave Accrual Calculator

Calculate leave accrued from annual entitlement and months worked, minus leave used.

LED Series Resistor Calculator

Calculate the series resistor value and power from supply voltage, LED voltage and current.

Macro Calculator

Convert daily calories and macro percentages into grams of protein, carbohydrate and fat.

Maintenance Work Order Builder

Build a clear work order text from title, asset, priority, due date and description.

Markup Calculator

Enter a cost and a markup percentage to get the selling price, profit per unit and profit margin.

Measuring Cups to Grams Converter

Pick an ingredient and enter cups to convert the amount into grams using typical density values.

Meeting Cost Calculator

Enter how many people attend, their average hourly cost and the meeting length to see what the meeting costs.

Meeting Time Planner

Enter a start time and a list of time-zone offsets to see the local start and end time for each attendee.

Menstrual Period Calculator

Enter the first day of your last period, your usual cycle length and period length to estimate the next period and ovulation.

Microstrip Impedance Calculator

Enter trace width, dielectric height and dielectric constant to estimate effective permittivity and characteristic impedance.

Military Time Converter

Enter a time and pick a direction to convert between military time and the 12-hour clock.

Mobile Data Usage Calculator

Enter your plan size, data used so far and days elapsed to project month-end use and see if you are over or under.

Money Counter (Cash Denomination Calculator)

Enter how many notes of each value you have to get the total cash amount with a breakdown.

Months Between Dates Calculator

Enter a start date and an end date to get the number of full months between them plus the remaining days.

Mortgage Affordability Calculator

Enter annual income, deposit, interest rate, term and a housing-cost share to estimate an affordable loan and price.

Mortgage Calculator

Enter a loan amount, interest rate and term to see the monthly payment, total paid and total interest.

MOSFET Gate Resistor Calculator

Enter the wanted rise time, gate capacitance and drive voltage to estimate a gate resistor and peak gate current.

Motor Full-Load Current Calculator

Enter motor power, voltage, power factor, efficiency and phases to estimate full-load current.

Motor Slip Calculator

Enter supply frequency, pole count and rotor speed to get synchronous speed, slip in rpm and slip percentage.

Motor Starting Current Calculator

Enter full-load current and the starting multiple to estimate the starting current.

MTBF and MTTR Calculator

Enter total operating hours, failure count and total repair time to get MTBF, MTTR and availability.

Mulch Calculator

Enter bed length, width and mulch depth to get volume in cubic feet, cubic yards and bags.

Multimeter Reading Log

Paste comma-separated readings to get the count, average, minimum, maximum and range.

Mutual Fund Lumpsum Calculator

Enter a one-time amount, expected annual return and years to see the projected value and gain.

Notice Period Date Calculator

Enter the resignation date and the notice period in calendar days to get the last working day.

NPS and CSAT Dashboard Builder

Enter promoter, passive and detractor counts plus satisfied responses to build a small NPS and CSAT summary.

NPV Calculator

Enter a discount rate, an initial investment and future cash flows to get net present value.

Nth Root Calculator

Enter a number and a root degree to get the nth root, including cube roots and odd roots of negatives.

Ohm's Law Calculator

Enter current and resistance to get voltage and power from Ohm's law.

One Rep Max Calculator

Estimate your one-rep max from a weight you lifted and the reps you managed.

Operational Amplifier Gain Calculator

Enter feedback and input resistor values to get non-inverting op-amp gain.

Operational Incident Cost Calculator

Estimate incident cost from downtime hours, hourly cost and repair spend.

Outlier Calculator

Find outliers in a list of numbers using the IQR rule.

Overall Equipment Effectiveness Calculator

Work out OEE from availability, performance and quality percentages.

Overtime Pay Calculator

Work out regular, overtime and total pay from hours, rate and multiplier.

Ovulation Calculator

Estimate ovulation day and fertile window from last period date and cycle length.

PCB Trace Width Calculator

Estimate external PCB trace width from current, temperature rise and copper weight.

PCB Via Current Calculator

Estimate via current capacity from hole diameter and temperature rise.

PERT Project Estimator

Estimate task time and spread from optimistic, likely and pessimistic figures.

Power Factor Correction Calculator

Work out capacitor kVAR needed to lift power factor to a target.

Pregnancy Due Date Calculator

Estimate a due date from the first day of the last period.

Present Value Calculator

Discount a future sum to present value from rate and years.

Preventive Maintenance Checklist Builder

Build a maintenance checklist from equipment, tasks and an interval.

Profit Margin Calculator

Work out profit and margin percentage from revenue and cost.

PT100 RTD Temperature Converter

Convert temperature to PT100 resistance with Callendar-Van Dusen.

Quadratic Equation Solver

Solve ax squared + bx + c and show discriminant and real roots.

Quartile Calculator

Get Q1, median and Q3 for a list of numbers.

Quaternion Calculator

Multiply two quaternions and show the resulting components.

Quick Ratio Calculator

Work out the quick ratio from current assets, inventory and liabilities.

Rainwater Harvesting Calculator

Estimate annual rainwater collection from roof area and rainfall.

RC Time Constant Calculator

Work out RC time constant and five time constants from R and C.

Rent vs Buy Calculator

Compare total rent against total monthly ownership cost over years.

Resistor Color Code Calculator

Enter four colour bands and read the resistance value with its tolerance range.

Resistor Tolerance Checker

Enter a rated value, tolerance and measured value to check if the resistor is in spec.

Resume ATS Score Checker

Paste resume text and keywords to see how many target keywords your resume contains.

Resume Job Description Matcher

Paste resume text and job keywords to compare your resume against a job description.

Resume Keyword Optimizer

Paste resume text and keywords to count each keyword and spot gaps.

RICE Prioritization Calculator

Enter reach, impact, confidence and effort to get a RICE prioritization score.

RL Time Constant Calculator

Enter inductance and resistance to get the RL time constant in seconds.

ROI Calculator

Enter gain and cost to get profit and ROI percentage.

Roof Pitch Calculator

Enter rise and run to get roof pitch, slope and angle.

Room BTU Calculator

Enter room size, windows and occupants for a rough BTU estimate.

Running Pace Calculator

Enter distance and time to get pace per kilometre and average speed.

SaaS MRR and ARR Calculator

Enter customers and revenue per customer to get MRR and ARR.

SaaS Unit Economics Calculator

Enter CAC, revenue, margin and churn to get LTV and the LTV to CAC ratio.

Safety Stock Calculator

Enter service factor, demand variation and lead time to get safety stock.

Salary Hike Calculator

Enter current salary and hike percentage to get the new salary.

Salary Offer Comparator

Enter two offers, each with salary and bonus, to compare their totals.

Salary to Hourly Rate Calculator

Enter annual salary, weeks and hours per week to get the hourly rate.

Sales Commission Plan Calculator

Enter base pay, sales and commission rate to get commission and total pay.

Sales Tax Calculator

Enter price and tax rate to get the tax amount and total price.

Savings Goal Calculator

Enter target, current savings and monthly saving to get months to goal.

Screen Size Calculator

Enter diagonal size and aspect ratio to get screen width and height.

Sensor Calibration Calculator

Enter two calibration points and a raw reading to get the calibrated value.

SEPA Creditor Reference Generator

Enter country code, business code and national identifier to build a creditor reference.

Shift Handover Note Builder

Enter shift details and tasks to build a handover note you can copy.

Shift Schedule Planner

Enter staff count, shifts per day, days per week and shift length to get total weekly shifts and staff hours.

Shoe Size Converter

Enter a US men's shoe size to see the approximate EU size, UK size and foot length in centimetres.

Short-Circuit Current Calculator

Enter supply voltage, fault resistance and reactance to estimate fault impedance and short-circuit current.

Signal-to-Noise Ratio Calculator

Enter signal power and noise power in the same units to get the ratio and its value in decibels.

Single-Phase Power Calculator

Enter voltage, current and power factor to get single-phase active power in watts and kilowatts.

SIP Calculator

Enter a monthly instalment, expected annual return and years to project maturity value, invested amount and gain.

Skills Gap Matrix Builder

Enter a skill name, its required level and current level from 1 to 5 to see the gap, coverage and priority.

SLA Uptime Calculator

Enter an uptime percentage to see allowed downtime per month and per year in minutes and hours.

Sleep Calculator

Enter a wake time and a number of 90-minute sleep cycles to get a suggested bedtime allowing 15 minutes to fall asleep.

SMD Resistor Code Calculator

Enter a 3-digit SMD resistor code to get its resistance in ohms and a readable value.

Solar Panel Output Calculator

Enter panel wattage, panel count and peak sun hours to estimate daily and monthly energy output.

Spare Parts Consumption Calculator

Enter opening stock, parts received, closing stock and days to get total consumption and average daily use.

Square Footage Calculator

Enter length and width in feet to get area in square feet and square metres.

Staffing Capacity Planner

Enter staff count, contracted hours per person per week and utilisation to get effective weekly capacity.

Staircase Calculator

Enter total rise, desired riser height and tread depth to get step count, actual riser height and total run.

STAR Interview Answer Builder

Fill in Situation, Task, Action and Result to build a structured answer draft and see its word count.

Star-Delta Starter Calculator

Enter line voltage, line current and connection type to get phase voltage and phase current.

Steps to Distance Calculator

Enter step count and stride length in centimetres to get distance in kilometres and miles.

Stock Average Calculator

Enter quantity and price for two purchases to get average cost per share and total cost.

Sukanya Samriddhi Yojana Calculator

Enter a yearly deposit, an annual interest rate and years to project maturity value, total deposited and interest.

Survey Response Analyzer

Enter total responses, positive responses and negative responses to get counts and percentages for all three groups.

SWIFT/BIC Code Finder

Enter a SWIFT/BIC code to check its format and see its bank, country, location and branch parts.

SWP Calculator

Enter starting balance, monthly withdrawal, expected annual return and months to project the remaining balance.

TDEE Calculator

Enter weight, height, age, sex and activity level to estimate basal metabolic rate and total daily energy expenditure.

Thermocouple Temperature Converter

Enter a Type K thermocouple reading in millivolts to get an approximate temperature in Celsius and Fahrenheit.

Three-Phase Power Calculator

Enter line voltage, line current and power factor to get three-phase real power in watts and kilowatts.

Timesheet Hours Calculator

Enter a start time, end time, unpaid break and days worked to get daily and weekly hours.

Total Compensation Calculator

Enter base salary, annual bonus and the yearly value of benefits to see total compensation.

Transformer Current Calculator

Enter a transformer rating in kVA, a voltage and the phase type to estimate the line current.

Transformer kVA Calculator

Enter voltage, current and phase type to estimate the transformer rating in kVA.

Transistor Bias Calculator

Enter supply voltage, divider resistors and emitter resistor to estimate base voltage and collector current.

UK Sort Code Finder

Enter six digits to see the sort code in XX-XX-XX form and whether its pattern is valid.

Unequal Bill Split Calculator

Enter the bill total and each person's percentage share to see what each person pays.

Unit Price Comparison Calculator

Enter two prices and quantities to compare price per unit and find the cheaper pack.

UPI ID Format Validator

Enter a UPI ID to check whether it matches the usual username at bank-handle pattern.

US Routing Number Validator

Enter a nine-digit US routing number to run the ABA check digit calculation.

VAT Calculator

Enter a net price and a VAT rate to get the VAT amount and the gross price.

Voltage Divider Calculator

Enter input voltage and two resistor values to get the divider output voltage.

Voltage Drop Calculator

Enter current, cable resistance per kilometre, run length and supply voltage to estimate voltage drop.

Wallpaper Roll Calculator

Enter wall length and height plus roll width and length to get area, coverage and rolls needed.

Water Tank Capacity Calculator

Pick a tank shape and enter its size to get capacity in cubic metres and litres.

Week Number Calculator

Enter a date to get its ISO week number and ISO year.

Working Days Calculator

Enter a start and end date to count the Monday to Friday days between them, inclusive.

XIRR Calculator

Enter dated cash flows as date and amount pairs to estimate the XIRR annual return.

Zakat al-Fitr Calculator

Enter the number of people and the amount per person to get the household Zakat al-Fitr total.

Zakat Calculator

Enter total zakatable wealth and a rate to calculate the Zakat amount.

Zen Box Breathing Timer

Set four equal phase lengths and start a simple box breathing timer that cycles through the phases.

Zero-Based Budget Calculator

Enter monthly income and planned expenses to see the total spent and what is left to assign.

Zero-Cost EMI Calculator

Enter a price, the number of months and any fee to see the monthly instalment and total paid.

Zero-Coupon Bond Calculator

Enter a face value, yield and years to maturity to price a zero-coupon bond.

Zero-Emission Vehicle Savings Calculator

Enter yearly distance and fuel and electricity prices to compare petrol and electric running costs.

Zero-Percent Balance Transfer Calculator

Enter a balance, transfer fee and promo months to see the fee and monthly payment.

Zeros in Factorial Calculator

Enter a whole number to count the trailing zeros in its factorial.

Zodiac Animal Calculator (Chinese Zodiac)

Enter a year to find its Chinese zodiac animal from the 12-year cycle.

Zodiac Birth Chart Calculator

Enter a birth date to see a simple date-only sun-sign chart summary.

Zodiac Compatibility Calculator

Pick two zodiac signs to see a fun, entertainment-only match score.

Zodiac Mercury Retrograde Calendar

Pick a date to check it against the approximate retrograde reference periods shown.

Zodiac Moon Sign Calculator

Enter a birth date for a rough, date-only moon-sign estimate.

Zodiac Rising Sign Calculator

Enter a birth date for a sunrise-approximation rising sign.

Zodiac Saturn Return Calculator

Enter a birth date to estimate your Saturn return years.

Zodiac Venus Sign Calculator

Enter a birth date for a rough, date-only Venus-sign estimate.

Zone 2 Heart Rate Calculator

Enter your age to see your Zone 2 heart-rate range.

Zone Diet Block Calculator

Enter daily Zone blocks to see the protein, carb and fat grams they represent.

Zoom Lens Crop Factor Calculator

Enter a focal length and crop factor to see the effective focal length.

Z-Score Calculator

Enter a value, mean and standard deviation to get the z-score.

Zulu Time Converter

Enter a local time and its UTC offset to convert it to Zulu time.

Accessibility Contrast Matrix

Enter a foreground colour and two background colours to see their contrast ratios.

Accessible Name Debugger

Paste a markup snippet to check images, buttons and inputs for accessible names.

Add Watermark to Image

Pick an image, type watermark text and a position, then preview and download it.

Aspect Ratio Calculator

Enter a width and height to see the simplified aspect ratio.

Base32 Decoder

Paste Base32 text to decode it back to plain text.

Base32 Encoder

Type plain text to encode it into Base32.

Base64 to Image Converter

Paste a Base64 image string or upload a file to preview the image and download it.

Binary to Text Decoder

Paste binary digits, spaced or continuous, to decode them back into readable text.

Browser Cache Policy Builder

Pick a resource type and caching values to build a ready-to-use Cache-Control header.

CLS Layout Shift Debugger

Paste layout-shift values from a report to total them, find the largest shift, and rate the result.

Color Code Picker

Enter a hex colour code to see its RGB and HSL values, a preview, and its complement.

Color Palette Extractor

Upload an image to pull out its most common colours as hex codes, right in your browser.

Column to Comma Separated List

Paste a column of values, one per line, and turn it into one comma separated line.

Comma Separated List to Column

Paste a comma separated line and split it into a column with one value per line.

Compare Text String

Paste two texts to see shared lines and lines added or removed between them.

Compression Savings Estimator

Enter an original size and file type to estimate compressed sizes and savings.

Core Web Vitals Budget Calculator

Enter measured LCP, INP and CLS values to check each against its recommended budget.

Critical Request Chain Visualizer

Paste requests with durations and dependencies to find the longest chain and its total time.

Crop Image Online

Upload a picture, set a crop rectangle, and preview and download the cropped result in your browser.

CSS Coverage Analyzer

Paste CSS to count rules and selectors, and find empty rules, duplicates, and important flags.

CSS Minify

Paste CSS to strip comments and extra spaces and get a smaller single-line version.

DOM Complexity Analyzer

Paste HTML to count elements, measure nesting depth, and list the most used tags.

Extract URL Links From Text

Paste any text to pull out the web addresses it contains, one per line, duplicates removed.

Generate Missing HTML Tags

Paste an HTML fragment to find unclosed tags and get a corrected version with them added.

HMAC Generator

Enter a key and a message to create an HMAC code with SHA-256, SHA-384 or SHA-512.

HTML Entity Encoder and Decoder

Encode special characters into HTML entities, or decode entities back into plain characters.

HTML Minify

Paste HTML to strip comments and collapse extra whitespace between tags into a smaller version.

HTML Semantic Outline Checker

Paste HTML to list its headings in order and flag skipped levels and multiple top headings.

HTML Table Generator

Enter rows, columns and cell text to generate a clean HTML table you can copy into a page.

HTML to Markdown Converter

Paste simple HTML to convert headings, links, bold, italic and lists into Markdown text.

Image Delivery Optimizer

Enter an original size and widths to estimate the delivered size and saving.

Image to Base64 Converter

Choose an image file or type text to encode it as Base64, all in your browser.

INP Interaction Profiler

Paste interaction timings, one per line, to summarise them in your browser.

JavaScript Bundle Analyzer

Paste bundle sizes, one per line, to see totals and the largest file.

JavaScript Minify

Paste JavaScript to strip comments and extra whitespace from it.

JavaScript Obfuscator

Paste JavaScript to encode its string literals into a string table.

JSON to XML Converter

Paste JSON to convert it into XML in your browser.

Keyboard Navigation Auditor

Paste markup to check it for common keyboard navigation issues.

LCP Element Analyzer

Paste element timings, one per line, to find the slowest element.

Multiline String to Singleline Text Converter

Paste lines of text and pick a separator to join them into one line.

NATO Phonetic Alphabet Converter

Type text to spell it out with NATO phonetic code words.

Number to Words Converter

Type a whole number to write it out in English words.

One-Time Password Generator

Enter your Base32 secret to generate a time-based code in your browser.

Online Notepad

Type notes to save them in your browser and see the word count.

Preload and Preconnect Builder

Enter resources, one per line, to build preload and preconnect tags.

Quote Image Generator

Type a quote and author to draw a shareable quote image locally.

Remove Empty Lines

Paste text to remove its blank lines.

Remove HTML Tags

Paste markup to strip its tags and leave plain text.

Resource Waterfall Analyzer

Paste resource timings, one per line, to summarise the load order.

Responsive Image srcset Builder

Enter an image file name and widths to build a srcset list.

Rich Text HTML Editor

Type in the editable area, then press Generate to see its HTML.

Rotate and Flip Image

Choose an image file, rotation and flips to transform it locally.

String Builder

Join lines of text into one string with a separator, prefix and suffix of your choice.

Text to Binary Encoder

Convert text to 8-bit binary, with one byte shown for each character.

Third-Party Performance Budget Calculator

Compare third-party size against a total page budget to see its share and remaining headroom.

URL Slug Generator

Turn a title into a clean lowercase slug with words joined by hyphens.

Web Font Loading Optimizer

Plan preloaded versus deferred fonts from font count and average file size.

XML to JSON Converter

Convert simple XML elements to JSON, fully in the browser.

Zalgo Text Generator

Add decorative combining marks to text for a glitch-style effect.

Zero Padding Number Generator

Pad a whole number with leading zeros to reach a chosen width.

Zero-Width Character Remover

Remove invisible zero-width characters from pasted text and count how many were found.

Zip Code Extractor

Extract postal code patterns from pasted text. Matches are pattern-only and not verified addresses.

Zoom Aspect Ratio Calculator

Simplify any width and height to a ratio such as 16:9.

Zoom Virtual Background Resizer

Resize an image in your browser to a virtual-background size. Nothing is uploaded.

A Record Lookup

Check the format of a pasted A record. No live DNS lookup is performed.

AAAA Record Lookup

Check the format of a pasted AAAA record. No live DNS lookup is performed.

A2Z Device Health Check

See what your browser reports about this device, such as screen size and online status.

Ads.txt Checker

Validate pasted ads.txt lines for format. It does not load a live ads.txt file.

AI Bot Robots.txt Policy Builder

Build a robots.txt snippet for named AI bots with an allow or disallow rule.

AI Crawler Access Checker

Check pasted robots.txt rules for one bot. It does not crawl or visit a live site.

All in One Chat Widget

Build a simple chat widget snippet from a title and channel names.

Android Deep Link Builder

Build a custom-scheme deep link from scheme, host, path and a parameter.

Android Phone Test

See what your browser reports on this phone, such as screen size and orientation.

Android Screen Density Calculator

Enter pixel width, pixel height and diagonal inches to get density, bucket and dp size.

Answer-First Content Analyzer

Paste your opening text to check first-sentence length, word counts and directness.

APK Manifest Viewer

Paste manifest XML text to list its package, version, permissions and activities.

App Store Metadata Length Checker

Enter app metadata to check each field against its character limit.

App Store Screenshot Size Checker

Choose an image file on your device to check its pixel size against listed sizes.

App-ads.txt Checker

Paste app-ads.txt content to validate each line and count valid and invalid entries.

Apple App Site Association Validator

Paste association file JSON to check its applinks structure and app IDs.

Assetlinks.json Validator

Paste assetlinks JSON to check relations, package names and fingerprint format.

Authentication Anomaly Analyzer

Paste login log lines to count attempts, failures and flagged users.

AWS CloudTrail Log Analyzer

Paste log JSON to count events, errors and activity per user.

Baggage Allowance Planner

Enter bag counts, weights, allowances and fee per kilo to plan excess charges.

BIMI Checker

Paste a BIMI record to check its version, logo and authority fields.

BIMI SVG Validator

Paste SVG text to check its root element, title and risky elements.

Brand Entity Consistency Checker

Enter an official brand name and pasted mentions to find inconsistent spellings.

CAA Lookup

Paste CAA record lines to check flags, tags and quoted values.

Cache-Control Checker

Paste a Cache-Control header value to list directives and flag conflicts.

Canonical Tag Checker

Paste HTML head text to find canonical tags and check their addresses.

CDN Checker

Paste response headers and see which ones point to a content delivery network.

Certificate and Private Key Matcher

Paste a certificate and an RSA private key to check, in your browser, whether their public-key material matches.

Certificate Authority Checker

Paste certificate detail text to check its issuer, subject, self-signed status and expiry date.

Claim Source Mapper

Paste claims and sources, one per line, to map each claim to its matching source.

Click speed test

Start a timed test, click the pad as fast as you can, and see your clicks per second.

Clickjacking Protection Tester

Paste response headers to check X-Frame-Options and frame-ancestors protection.

Client-Side Secret Exposure Checker

Paste code to scan it for common secret patterns such as API keys and private-key blocks.

Cloud Egress Cost Calculator

Enter gigabytes transferred, price per gigabyte and any free allowance to estimate egress cost.

Cloud IAM Policy Analyzer

Paste an IAM policy in JSON to flag wildcard actions, resources and overly broad allows.

CNAME Lookup

Paste CNAME records to validate their format. No live DNS lookup is performed.

Complete Email Security Checker

Paste SPF, DKIM and DMARC records to check their format. No live DNS check is performed.

Concrete Calculator

Enter slab length, width, depth and waste to work out concrete volume and bag count.

Connection test

Check whether this browser reports itself online and time a request to the current origin only.

Content Cannibalization Comparator

Paste two texts to compare their word overlap and spot possible cannibalization.

Content Freshness Analyzer

Paste content with its publish and update dates to judge freshness and word count.

Cookie Security Checker

Paste Set-Cookie headers to check Secure, HttpOnly, SameSite and expiry flags.

Coordinate Format Converter

Enter decimal latitude and longitude to convert them to degrees, minutes and seconds.

CORS Checker

Paste response headers to check CORS allow-origin, methods and credentials settings.

CRL Distribution Point Checker

Paste certificate text to extract CRL distribution points and check their format.

Cross-Origin Embedder Policy Checker

Paste response headers to check Cross-Origin-Embedder-Policy and Opener-Policy values.

Cross-Origin Isolation Checker

Paste response headers to check whether COOP plus COEP indicate cross-origin isolation.

Cross-Origin Opener Policy Checker

Paste response headers and check the Cross-Origin-Opener-Policy value they carry.

Cross-Origin Policy Bundle Generator

Pick COOP, COEP and CORP values and generate a matching set of response headers.

Cross-Origin Resource Policy Checker

Paste response headers and check the Cross-Origin-Resource-Policy value they carry.

CSP Checker

Paste a Content-Security-Policy header and check its directives for risky values.

CSP Generator

Enter allowed sources per directive and generate a Content-Security-Policy header.

CSP Nonce and Hash Generator

Generate a random CSP nonce and the SHA-256 hash of pasted content, in your browser.

CSP Report Analyzer

Paste a CSP violation report in JSON and read its blocked URI and violated directive.

CSR Decoder and Validator

Paste a certificate signing request in PEM form and check its basic structure.

CSRF Defense Configuration Checker

Paste configuration or header notes and check which common CSRF defenses are mentioned.

Currency Exchange Fee Calculator

Enter an amount, a fee percentage, a fixed fee and an exchange rate to estimate what arrives.

Cyber Security Tools

Describe what you want to protect and get a checklist of security tool types to consider.

CycloneDX Validator

Paste a CycloneDX SBOM in JSON and validate its required fields and component entries.

DANE TLSA Generator and Validator

Generate a TLSA record from usage, selector and matching type, or validate a pasted record.

Dead pixel test

Show a fullscreen solid colour in your browser and look for dead or stuck pixels.

Dependency End-of-Life Checker

Enter dependencies with their end-of-life dates and see which are expired or due soon.

Desktop Computer Test

Read browser-visible values for this device: screen, cores, memory and platform.

Distance between Two Lat Long

Enter two latitude and longitude pairs and get the great-circle distance between them.

DKIM Checker

Paste a DKIM signature header or DNS record and check its required tags.

DMARC Checker

Paste a DMARC record and check its version, policy and reporting tags.

DMARC Record Generator

Enter a domain, policy and reporting address to generate a DMARC DNS record.

DMARC XML Report Analyzer

Paste a DMARC aggregate report in XML and read its organisation, dates and records.

DNS Lookup

Paste DNS records and validate their format by type, without a live lookup.

DNSSEC Checker

Paste DNSKEY or DS records and check whether their fields are well-formed.

DNSSEC Validator

Paste RRSIG or DNSKEY records and validate that their expected fields are present.

Domain Name Generator

Enter keywords and get combined domain name ideas to check with your registrar.

Double click test

Click the pad in your browser and measure the gaps between your clicks.

Download Time Calculator

Divide a file size by a connection speed to estimate how long a download takes.

Ecommerce Profit Calculator

Subtract product costs, fees and shipping from revenue to estimate ecommerce profit.

Elevation Gain Calculator

Add up the upward steps in a list of elevation points to get total gain.

Email Header Analyzer

Paste email headers and read out From, To, Subject, Date and Received hops.

Entra Sign-In Log Analyzer

Paste sign-in log lines and summarise successes, failures and counts per user.

EXIF Privacy Remover

Re-encode a locally chosen image in your browser to strip its EXIF metadata.

External Resource Inventory

Paste HTML and list every external and local resource URL it references.

Facebook Chat Widget

Generate a customer-chat snippet from your Page ID, theme colour and greeting.

File Checksum Verifier

Hash a locally chosen file with SHA-256 and compare it to an expected hash.

File Entropy Analyzer

Measure the Shannon entropy of a locally chosen file to gauge its randomness.

File Integrity Manifest Generator

Hash locally chosen files with SHA-256 and build a downloadable manifest list.

File Type and Magic Byte Detector

Read the first bytes of a local file and detect its type from its magic signature.

File Upload Security Policy Builder

Build an upload-security checklist from size limits, allowed types and hardening options.

Final Grade Calculator

Average weighted grades entered as score:weight to get a final grade and letter band.

Firewall Rule Analyzer

Paste firewall rules and flag overly broad allow-any and wide-port rules.

Flight Carbon Emissions Calculator

Estimate flight CO2 from distance, passengers and cabin class using a stated factor.

Flight Time Calculator

Estimate flight time from distance and cruising speed, with a time-zone shift you enter.

Free Website Widgets

Generate self-contained embed code for a simple clock, countdown or text widget.

Gamepad tester

Test a gamepad connected to your own device, using your browser's Gamepad API.

Geohash Encoder and Decoder

Encode latitude and longitude as a geohash, or decode a geohash back to coordinates.

Ghosting test

Run a moving-pattern test on your own screen to look for motion blur or ghosting.

GitHub Actions Workflow Visualizer

Paste workflow YAML and see its jobs and steps laid out in order.

Google Merchant Feed Optimizer

Paste feed rows and flag missing or short fields before you use the feed.

GPA Calculator

Work out a weighted GPA from grade and credit lines you enter.

GraphQL Schema Security Auditor

Paste a GraphQL schema and flag risky patterns such as sensitive fields.

Gyroscope test

Read your own device's orientation and motion sensors in your browser.

HAR File Viewer

Choose a HAR file on your device, or paste HAR JSON, and see a summary.

Headphone test

Play test tones in your own browser to check left, right and balance.

Hiking Time Calculator

Estimate walking time from distance and ascent using Naismith's rule.

Hreflang Checker

Paste HTML and check hreflang tags for duplicates and missing entries.

HSTS Checker

Paste response headers and check the Strict-Transport-Security header.

Htaccess Redirect Generator

Generate redirect rules from old and new paths you enter.

HTTP Compression Checker

Paste response headers and check for compression headers.

HTTP Headers Checker

Paste response headers and list which common security headers are present.

HTTP Methods Exposure Checker

Paste an Allow header or options response and flag exposed methods.

HTTP Protocol Checker

Paste a response first line and identify its HTTP version.

HTTP Status Code Checker

Enter a status code and see its meaning and class.

HTTPS Checker

Check pasted URL text and headers for secure-scheme and HSTS signs.

HTTPS Redirect Checker

Paste a redirect chain and check that it ends correctly.

IaC Security Checker

Paste Terraform or CloudFormation text and flag risky patterns like public buckets and open security groups.

Iframe Sandbox Policy Builder

Pick sandbox permissions and get an iframe snippet with exactly the sandbox tokens you chose.

iMac Test

Run screen and device checks in your own browser and see what this device reports.

Incident Response Workspace

Build a local incident timeline and checklist from events you enter, all in your browser.

Internal Link Opportunity Mapper

Paste page titles and text to find pages that share keywords and could link to each other.

International Address Format Builder

Enter address fields in your chosen order and get a printable address template.

IOC Defang and Refang Tool

Defang pasted indicators for safe sharing, or refang defanged text back to normal form.

IOC Extractor

Paste text and extract IP addresses, domains, URLs and hashes found inside it.

IOC Normalizer and Deduplicator

Paste an indicator list to normalise case and format, remove duplicates and sort it.

IOC to STIX Converter

Convert pasted IPs and domains into STIX 2.1 indicator objects as JSON.

iOS Universal Link Builder

Enter domains and paths to build an applinks association file and sample universal links.

IP and CIDR Subnet Calculator

Enter an IP address and prefix length to get the network, broadcast, mask and usable host range.

IPA Property List Viewer

Choose a plist file or paste plist XML to view its keys and values in your browser.

iPad Test

Check screen size, pixel ratio, touch support and orientation on the device running this page.

iPhone Test

Check screen size, pixel ratio, touch support and orientation on the device running this page.

JavaScript Source Map Exposure Checker

Paste HTML or headers to flag source map references such as .map files and sourceMappingURL comments.

Jet Lag Adjustment Planner

Enter home and destination UTC offsets to get a day-by-day sleep-shift schedule.

JWK and JWKS Viewer

Paste JWK or JWKS JSON to view key type, use, key ID, algorithm and expiry for each key.

JWK and PEM Converter

Convert an RSA public key between JWK and PEM formats, in both directions, in your browser.

JWT Security Analyzer

Paste a JWT to decode its header and payload and flag risky settings like alg none or missing expiry.

JWT Signature Verifier

Verify an HMAC JWT signature in your browser with a test secret you provide, via Web Crypto.

Key rollover test

Click the test area and hold keys together to count how many your keyboard registers at once.

Keyboard tester

Press keys on your own keyboard and see each key, code and modifier shown live in your browser.

Kubernetes Manifest Visualizer

Paste a Kubernetes YAML manifest and see its workloads, containers and images laid out as a readable summary.

Kubernetes Resource Calculator

Enter per-pod CPU and memory requests and limits plus replicas, and get total cluster resource needs.

Kubernetes Security Checker

Paste a Kubernetes manifest and flag risky settings such as privileged containers and host networking.

Landing Page Message Match Checker

Compare pasted ad copy with pasted landing page text and see which ad keywords the page actually covers.

Laptop Test

Run screen, keyboard and pointer checks on the laptop or device you are using right now, in your browser.

Live Chat Widget

Generate a small embed snippet for a chat widget box on your own site, with your greeting and position.

llms.txt Builder

Build an llms.txt file from your site title and a list of pages, ready to paste into your site root.

Llms.txt Checker and Generator

Paste an llms.txt file to check its structure, then get a cleaned-up generated version of the same file.

Log Timestamp Normalizer

Paste log lines with mixed timestamps and rewrite them all in one consistent format, ISO or epoch seconds.

MacBook Test

Check the display size, pixel ratio and input of the Mac or device you are using right now, in your browser.

Marketplace Fee Calculator

Enter a sale price and marketplace fee to estimate the fee amount and what you keep, as an estimate only.

Metatag Length checker

Paste page HTML and check whether the title tag and meta description lengths sit in sensible ranges.

Microphone test

Test the microphone on this device, either live with permission or from sample level values you enter.

Mileage Calculator (MPG and km/L)

Enter distance and fuel used to see mileage in miles per gallon, kilometres per litre and litres per 100 km.

MIME Type and Magic Byte Checker

Check a local file signature or pasted magic bytes to identify a file type, without uploading anything.

MITRE ATT&CK Coverage Heatmap

Paste your own technique list with the tactic you assign to each, and see coverage counts grouped by your tactics.

MITRE ATT&CK Mapper

Map pasted technique IDs to the tactics you assign, and get a clean mapping table plus per-tactic totals.

Mixed Content Checker

Paste page HTML and flag plain-http resources that would load insecurely on a secure page.

Mobile Push Payload Builder

Build a push notification JSON payload from a title, body, badge and extra data, ready to use in your own system.

Monitor test

Show solid colours, a gradient, a grid and sharpness text on this screen to inspect it yourself, in your browser.

Moon Phase Calculator

Enter a date and get the moon phase, illumination and moon age from a standard astronomical formula.

Mouse Test

Test the mouse or pointer on this device: clicks, right-clicks, scrolling and movement, tracked live in your browser.

MTA-STS Checker

Check a pasted MTA-STS policy for mode, hosts and max-age.

Multi-Format Log Parser

Sort pasted log lines into JSON, web-server and plain formats.

Multi-Touch Test

Count simultaneous touch points on your own device in this browser.

MX Lookup

Sort pasted MX records by priority and list their mail hosts.

NS Lookup

Count and de-duplicate pasted name server lines.

OAuth PKCE Generator

Build a PKCE verifier and SHA-256 code challenge in your browser.

OCSP Status Checker

Report the certificate status from pasted OCSP response text.

OIDC Discovery Analyzer

Check a pasted OpenID discovery document for issuer and endpoints.

Online Stopwatch

Time elapsed with a simple in-browser stopwatch.

Online Timer

Count down from a number of seconds in your browser.

Open Graph Checker

Check pasted HTML for Open Graph title, description, image and type.

Open Graph Meta Tag Generator

Build Open Graph meta tags from your title, description and image.

OpenAPI Security Auditor

Flag missing security and risky patterns in a pasted OpenAPI spec.

Package Typosquatting Checker

Compare a package name for typos against names you enter, not a registry.

Package URL (purl) Parser

Parse a package URL into type, namespace, name and version.

Paint Calculator

Estimate litres of paint needed for room walls.

Password Entropy Calculator

Estimate password entropy from length and character sets.

Password Policy Tester