Dead pixel test
Before buying a used phone or monitor, check the screen.
Everything happens in your browser: your files are never uploaded to a server.
Tap a colour or start the test. Tap the screen to change colour; Esc to exit.
How to use it
- Press start.
- Tap the screen to change colour.
- Look for dots that do not change.
FAQ
What is a dead pixel?
A dot that always shows black (dead) or a fixed colour (stuck).
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