What is a dead pixel?

A dead pixel is a pixel on an LCD or OLED screen that remains permanently unlit (black) or lit (white, red, green, blue). Dead pixels are caused by manufacturing defects or physical damage and cannot be fixed with software.

How does a dead pixel test work?

A dead pixel test displays full-screen solid colors (white, black, red, green, blue, cyan, magenta, yellow) one at a time. By cycling through these colors, any pixel that doesn't display correctly becomes visible against the uniform background.

Can dead pixels be fixed?

True dead pixels cannot be fixed with software — they are physically broken. However, "stuck" pixels (which display the wrong color rather than being black) can sometimes be fixed using rapid color cycling tools, with a 30-50% success rate on LCD panels.

Does this tool work on phones and tablets?

Yes! Proj-Dead-Pixel is fully mobile-optimized with touch controls including swipe navigation, long-press defect marking, and pinch-zoom. It works on any device with a modern web browser.

Is my data collected?

No. Proj-Dead-Pixel collects zero data. There are no accounts, no cookies (beyond what's necessary), no analytics trackers, and no server-side storage. All defect marking is stored temporarily in your browser's memory.

Dead Pixel Test — Free Online Screen Checker

Check your screen for dead pixels in 30 seconds. Free, instant, no download.

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No download. No registration. Works on any screen.

How It Works

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Clean your screen with a soft cloth

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Click "Start Test" to enter fullscreen mode

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Cycle through solid colors to spot defects

Why Use Proj-Dead-Pixel?

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8+ Color Tests

White, Black, Red, Green, Blue, Cyan, Magenta, Yellow — cover every type of pixel defect.

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Keyboard Shortcuts

Power users can zip through colors with arrow keys and number shortcuts.

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Mobile Friendly

Touch-optimized with swipe navigation and long-press defect marking.

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Defect Marking

Tap or click to mark dead pixels. Visual markers help you count and track defects.

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Stuck Pixel Fixer

Rapid color cycling may unstick stuck pixels. 30-50% success rate on LCD panels.

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100% Free

No ads, no paywalls, no data collection. Just a tool that works.

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