Dead Pixel Test
Find dead or stuck pixels on your screen with full-screen color cycles, and try to fix them.
1. Find dead or stuck pixels
The screen fills with black, white, red, green and blue. Look closely at each color from different angles. A dot that stays black is a dead pixel; a dot that stays red, green, blue or white is a stuck pixel.
2. Try to fix a stuck pixel
A rapidly flashing square can sometimes revive a stuck pixel. Drag the square over the pixel and leave it running for 10–30 minutes. It rarely helps dead (black) pixels.
Warning: the fixer flashes quickly. Do not use it if you are sensitive to flashing lights.
Continue your work
- Screen Test — Run a full screen and pattern test.
- Touch Screen Test — Test the touch layer too.
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Clear instructions
Find steps, examples and limitations below.
Use online
Open the tool in a supported web browser.
Free to use
No sign-up required. Tool-specific limits may apply.
How to use the Dead Pixel Test
Find dead or stuck pixels on your screen with full-screen color cycles, and try to fix them.
- 1 Clean the screen, then click Start the test.
- 2 Click through each color and look for dots that never change.
- 3 For a stuck pixel, open the pixel fixer, drag the flashing square over it and leave it running for 10–30 minutes.
Example and practical tips
A green dot that stays green on every color is a stuck pixel; running the fixer over it sometimes brings it back. A dot that stays black is dead and usually cannot be fixed.
Frequently asked questions
What is the difference between dead and stuck pixels?
A dead pixel is always black. A stuck pixel stays one color because a sub-pixel is always on.
Is the fixer safe?
It is safe for the screen, but it flashes quickly. Do not use it if you are sensitive to flashing lights.
Report an issue
Something broken or not quite right? Tell us and we will look into it.