Dead pixel test

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

Runs in your browser. Nothing is uploaded — your input is processed on this device and discarded when you close the tab.

Colour to display

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.

Choosing Black reports a fullscreen black screen with instructions to press Escape or click to exit.

This tool only displays solid colours in your own browser. It does not test any other device, and it cannot fix a pixel.

Can this fix a dead pixel?

No. It only displays solid colours so you can see a faulty pixel; it cannot repair one.

What if I see a mark on only one colour?

A mark visible on some colours and not others may be a stuck sub-pixel; check the screen is clean first.

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

Live

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

Live

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

Live