Disclaimer
Updated
Photosensitivity warning
Some tests show flashing lights, fast color changes or moving patterns, for example the stuck pixel fixer and motion tests. These can trigger seizures in people with photosensitive epilepsy. If you or anyone watching has this condition, don't use these tests. Every flashing test shows a warning and starts only after you click, and its default speed stays at or below 3 flashes per second. Stop at once if you feel dizzy, see altered vision or feel unwell.
Stuck pixel fixer
The stuck pixel fixer rapidly changes the colors of a small area of your screen. It sometimes revives a stuck pixel, but there is no guarantee, and it can't repair a dead pixel. Use it at your own risk. Never press on the screen or apply heat to try to fix a pixel: that can damage the panel.
Results are guidance, not a guarantee
A browser can't measure every property of your hardware, and results depend on your device, browser and settings. Use the results to spot problems and decide what to check next, and confirm important findings with the manufacturer's own tools or a repair shop.
Prank tools
Tools such as the hacker typer and the fake update screen are harmless jokes. They don't access, change or damage anything on your device, and they don't imitate real security warnings. Use them kindly and tell people it's a joke.
Affiliate links
This site doesn't use affiliate links. If that changes, this page and every affected page will say so clearly before the first link.
Contact
Questions are welcome at contact@pctesttools.com.