Online Stopwatch
Time elapsed with a simple in-browser stopwatch.
Runs in your browser. Nothing is uploaded — your input is processed on this device and discarded when you close the tab.
Online Stopwatch
How to use this tool
- Enter your values in the fields above.
- Press Generate to see the result.
- Use Load sample to try the worked example, Copy result to copy it, or Clear to start again.
Worked example
123456 milliseconds formats as 00:02:03.45.
What this tool does not do / Limits
This stopwatch runs only while this page is open. It is not a certified timer and it resets if you close or reload the page.
Frequently asked questions
Does it keep running if I close the page?
No. It stops when the page closes and starts again from zero.
Is it exact to the millisecond?
It displays hundredths of a second, but browser timing is approximate, not laboratory exact.
Related tools
CSV Cleaning Studio
Remove duplicates, fix missing values, standardise dates and export a clean CSV. Your file never leaves your device.
LiveChart Builder
Build charts from CSV data with aggregation, sorting and accessible colour palettes. Export as PNG or SVG.
LiveLength Converter
Convert lengths between metric and imperial units and see the full table of equivalents.
Live