How it works
Device tests use WebRTC getUserMedia or DOM keyboard events entirely client-side.
How to use Dead Pixel Test
- Enter fullscreen or maximize the test area.
- Tap or click to cycle solid test colors across the screen.
- Inspect edges and center for dark or stuck dots.
- Exit fullscreen and note pixel locations for warranty photos.
Worked examples
Concrete numbers and cases you can check against the tool above.
Quick check
Run once before your meeting; fix issues instead of apologizing on call.
When to use Dead Pixel Test
Manufacturers accept returns only with documented defects; solid fills make tiny dots obvious.
Common use cases
- Inspect new 27 in monitor during return period.
- Check used phone OLED before paying cash.
- Projector color uniformity spot check.
Inputs and outputs
- Fullscreen color fills
- Manual pixel inspection
Privacy
This tool runs entirely in your browser. Your data never leaves your device — nothing is uploaded to our servers.
Frequently asked questions
- Why is permission denied?
- Check OS privacy toggles and browser site settings, then reload.
- Is AV recorded?
- Mic and webcam tests stream locally unless you explicitly record elsewhere.
- Can I use on phone?
- Yes for many tests; CPS and keyboard tests suit desktop best.