Dead Pixel Test — Free Online Screen Checker

Display solid colors full-screen to find dead or stuck pixels on any device. Click a color or start the full test.

✓ Free ✓ No sign-up ✓ All devices ✓ Runs locally
Click any color for full screen. Space or → to cycle. Esc to exit. On mobile, tap to change colors.

More Screen Tools

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Stuck Pixel Fixer

Rapid color cycling to repair stuck pixels. Run for 10–30 minutes for best results.
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Burn-In Test

Check OLED and LCD screens for burn-in with uniform gray patterns.
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Screen Test

Gradients, checkerboard, color bars, and uniformity patterns for your monitor.
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Dead Pixel Guide

Learn about dead vs stuck pixels, causes, fixes, and device-specific testing tips.

Frequently Asked Questions

A pixel where all three sub-pixels (red, green, blue) have permanently failed, appearing as a tiny black dot on your screen. Unlike stuck ones, which display a fixed color, these defective pixels emit no light at all.

Stuck ones can often be fixed using rapid color cycling — try our pixel fixer for 20–30 minutes. Truly dead ones are usually permanent. If fixing doesn't work, check your warranty options.

Yes. Open this page on any device with a modern browser, tap a color to go full screen, and tap to cycle through colors. Works on iPhone, Android, iPad, and Kindle. Set brightness to maximum for the best results.

Dead ones appear black (all sub-pixels off). Stuck ones show a fixed color like red, green, or blue (one sub-pixel locked on). Stuck defects are often fixable; dead ones usually aren't. Read our complete guide for details.