Dead pixel test
Fill your screen with solid colors to find dead or stuck pixels.
Fill your screen with solid colors to spot stuck or dead pixels against a plain background.
Stuck pixel fixer
A rapidly flashing square can sometimes get a stuck pixel moving again by cycling its sub-pixels quickly.
Warning: this flashes rapidly and may trigger seizures in people with photosensitive epilepsy. Do not use it if that applies to you.
This feature is turned off because your device is set to reduce motion.
- 6 full-screen test colors
- Arrow keys or click to cycle
- Optional stuck-pixel fixer
How to test for dead pixels
- Press Start color test to fill the screen with black.
- Click, tap the arrow keys, or press space to cycle through white, red, green, blue and gray.
- Look closely for any dot that never changes color, then press Esc to exit.
Dead pixel test FAQ
What is the difference between a dead pixel and a stuck pixel?
A dead pixel stays black on every color because it gets no power. A stuck pixel is stuck on one color, usually red, green or blue, because one sub-pixel is stuck on or off while the others still work.
Does the stuck pixel fixer actually work?
It sometimes helps with a stuck pixel by rapidly cycling colors near the spot, which can free a sub-pixel that is stuck rather than truly dead. It does nothing for a genuinely dead pixel, since that pixel gets no signal at all.
Why is there a seizure warning?
The fixer flashes several times per second, and rapid flashing can trigger seizures in people with photosensitive epilepsy. Skip the fixer if that applies to you or anyone nearby.
Can a dead pixel be fixed?
No. A dead pixel has no working transistor behind it, so no software trick brings it back. Only a screen repair or replacement fixes a truly dead pixel.