Dead Pixel Test
Free online dead pixel test: cycle 12 full-screen colors — black, white, RGB, cyan, magenta, yellow, orange and grays — to find dead or stuck pixels.
Show solid colors and find pixels that remain visibly different.
- Start enters fullscreen — the pattern fills the whole screen with no other UI on it.
- Keyboard: ← previous · → / Space next · Esc finish. Touch: tap the left / right third of the surface, the middle to finish.
- Optional helpers: press Z for a 3 × 3 zone guide or A for 6-second auto advance (buttons below the pattern work when not in fullscreen).
- Using more than one display? Run the test on each screen you want to check.
What this result means
Display Checkup records visual observations and browser estimates. It cannot certify hardware or decide whether a product must be returned. Compare anything concerning with the seller’s policy.
Pixel Fixer — for stuck pixels
A stuck pixel holds one color and may recover after a few minutes of rapid color flashing. A truly dead pixel receives no power and cannot be repaired by software — for that, use the test above and your warranty.
Related tests
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Make it a full inspection
Run this test as part of a guided inspection and finish with a downloadable PDF report.
Frequently asked questions
Know the limits before you interpret a result.
Is this a hardware diagnostic?
No. Browser measurements are labeled as reported or estimated, and visual findings remain your own observation.
Does Display Checkup upload my screen data?
No. The tests and inspection record run in your browser. The report is generated locally.