Dead Pixel Checker
Use solid colours to find pixels that stay black or do not light up.
Screen Test Controls
Screen Resolution
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Viewport Size
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Device Pixel Ratio
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Preview
How to use:
Start the full-screen test, then look carefully for pixels that stay black, white, red, green, blue or any colour that does not match the rest of the screen. Use Space, Arrow keys, tap or swipe to change colours.
Start the full-screen test, then look carefully for pixels that stay black, white, red, green, blue or any colour that does not match the rest of the screen. Use Space, Arrow keys, tap or swipe to change colours.
What Is A Dead Pixel Test?
A dead pixel test displays full-screen solid colours so you can inspect your display for pixels that are not working correctly. Dead pixels, stuck pixels, bright pixels and colour defects are easier to spot when the entire screen is one colour.
Dead Pixel vs Stuck Pixel
A dead pixel usually appears as a permanently black pixel because it no longer lights up. A stuck pixel may stay red, green, blue or another colour even when the rest of the screen changes.
How To Check A Monitor For Dead Pixels
- Clean your screen gently so dust is not mistaken for a pixel defect.
- Start the full-screen test.
- Cycle through white, black, red, green and blue.
- Look closely for pixels that do not match the selected colour.
- Use grey screens to check uniformity, backlight bleed and dirty screen effect.
- If in full screen mode, use "escape" button to exit.
Common Screen Tests
Stuck Pixel Test
Use red, green, blue, white and black screens to spot pixels stuck on one colour.
OLED Burn-In Test
Use solid colours and grey screens to look for image retention or uneven wear.
Monitor Uniformity Test
Use grey screens to check for uneven brightness, backlight bleed or dirty screen effect.
Laptop Screen Test
Check new or used laptop screens before accepting a purchase or repair.
Phone Screen Test
Use full-screen colours on mobile to check for pixel and display issues.
Pixel Repair And Recovery
Some stuck pixels may respond to rapid colour cycling, but this is not guaranteed. The stuck pixel recovery mode flashes colours quickly and should be used carefully. Stop immediately if it causes discomfort.
Frequently Asked Questions
Can this fix a dead pixel?
No tool can guarantee fixing a dead pixel. A truly dead pixel is usually a hardware issue.
Can this help with stuck pixels?
Sometimes rapid colour cycling may help a stuck pixel, but results are not guaranteed.
What colours should I test?
Start with white, black, red, green and blue. Then test yellow, cyan, magenta and grey screens.
Does this work on phones?
Yes. The test works on phones, tablets, laptops, monitors and TVs with a browser.
Does this tool upload anything?
No. The dead pixel test runs locally in your browser using JavaScript.
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