Quickly find dead or stuck pixels on any screen with full-screen solid color cycling. Test every subpixel (red, green, blue) across your entire display.
Click a color swatch above or press ←→ to cycle colors.
Press Space for fullscreen, Esc to exit.
Send output to:
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How to use Dead Pixel Test
Press Space or click to enter fullscreen mode on the white test screen.
Click or press Right Arrow to cycle through all colors: black, red, green, blue, cyan, magenta, yellow, gray.
Look closely at each color for dots that don't match — black dots on bright screens, white dots on black, or wrong-color subpixels.
Press Esc to exit fullscreen when done.
What is Dead Pixel Test?
A dead pixel is a point on your screen that stays black regardless of what's displayed. A stuck pixel is locked to one color (red, green, or blue). This tool cycles through pure white, black, red, green, blue, cyan, magenta, and yellow screens so you can spot any defective pixels. Use fullscreen mode and get close to your display for the most thorough inspection.
Tip: clean your screen first — dust specks can look like dead pixels. If you find a stuck pixel (showing a constant color rather than black), gentle pressure or pixel-refresh videos may sometimes revive it.
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FAQ
What is the difference between a dead pixel and a stuck pixel?
A dead pixel is permanently black (all three subpixels off). A stuck pixel shows a constant color (red, green, blue, or a mix) because one or two subpixels are stuck on. Stuck pixels can sometimes be fixed; dead pixels usually cannot.
Can this test fix dead pixels?
No — this is a detection tool only. To attempt fixing a stuck pixel, try a pixel-refresh video (rapid color cycling), apply very gentle pressure with a soft cloth, or use software like JScreenFix. Dead (black) pixels are rarely repairable.
Does this work on phones and tablets?
Yes — open this page on any device with a browser. Use fullscreen mode and zoom in if needed to inspect small high-DPI screens.
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