Dead pixel test
Cycle red, green, blue, white, black, and gray full-screen panels to inspect a display visually.
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How to use it
Start the test and look closely at the screen as it shows solid colors. Click or press → for the next color and Esc to exit.
Good to know
A dead pixel stays black on every color; a stuck pixel stays one color. Clean the screen first so dust is not mistaken for a pixel.
Inspect each solid panel
Clean the display first, then start the full-screen test. Use right and left arrows, Space, Enter, or a click to move among red, green, blue, white, black, and gray; Escape exits. View each color at normal viewing distance and then closely enough to locate a dot that stays different from its surroundings.
A dot that remains dark on several bright colors may warrant another check. A dot with one persistent color can look different from its neighbors on the other panels.
Visual inspection has limits
Dust, smudges, screen coatings, viewing angle, brightness, and compression can resemble a pixel issue. The page cannot count subpixels, determine a panel warranty status, or repair a display. Full-screen mode is requested from the browser and may fall back to an in-page overlay.
Frequently asked questions
How do I check for dead pixels?
Run the full screen test and look for dots that do not match the color, especially on white and black.
What is the difference between a dead and a stuck pixel?
A dead pixel is always black. A stuck pixel is lit in one color (often red, green, or blue) and can sometimes recover.
Can I test a phone or TV?
Yes. Open this page on any device with a browser and start the test.