Pixel inspection
Dead Pixel Test
Use black, white, red, green and blue patterns to look for dead or stuck pixels.
Dead Pixel TestRuns locally · nothing is uploaded
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.
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.
Related tests
Checks that usually pair well with this one.
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.