Does My Monitor Have Dead Pixels?
Enter fullscreen and cycle through solid colors to spot defects. Dead pixels stay black on all colors. Stuck pixels show one fixed color. This test uses the Fullscreen API and Canvas rendering — no data leaves your browser.
This test displays fullscreen solid colors so you can visually identify dead pixels (always black) and stuck pixels (always one color) on your monitor.
Monitor manufacturers typically allow 1-5 dead pixels per million before qualifying for warranty replacement.
Click 'Enter Fullscreen' to start the test. Look for stuck or dead pixels on solid color backgrounds.
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What Do Your Results Mean?
| Result | Range | Meaning |
|---|---|---|
| Good | No defective pixels found on any of the 5 test colors | Your panel has no visible pixel defects — all sub-pixels are functioning correctly. |
| Warning | 1-2 stuck pixels (show a fixed color) | Stuck pixels may be recoverable using a pixel exerciser tool that rapidly cycles colors on the affected area for 20+ minutes. |
| Bad | 3+ dead pixels or clusters of defective pixels | Multiple dead pixels or pixel clusters typically indicate a panel defect — check your manufacturer's warranty policy for RMA eligibility. |
Common Issues and How to Fix Them
Cannot enter fullscreen mode
Some browsers block fullscreen from non-user gestures. Click the fullscreen button directly rather than using a keyboard shortcut. Disable browser extensions that may block the Fullscreen API.
Spot looks like a dead pixel but disappears when zooming in
Dust or debris on the screen surface can mimic dead pixels. Clean your screen with a microfiber cloth and retest before concluding it is a pixel defect.