Screen Dead Pixel Tester
UsefulProfessional diagnostic tool to detect dead or stuck pixels and verify color uniformity on any display.
Ready to test?
The test will enter fullscreen mode. Look closely for any spots that don't match the color on screen. We'll cycle through Red, Green, Blue, White, and Black.
Press ESC anytime to exit.
Cleaning
Clean your screen before starting to avoid mistaking dust for dead pixels.
Darken Room
Dim the lights in your room for better visibility of screen defects.
Look Closely
Examine corner to corner for stuck (bright) or dead (dark) pixels.
Verified Tool QualityLive & Secure
This tool has been extensively tested for accuracy and performance. On April 2026, our engineers verified the core logic to ensure 100% reliability and precision. Like all CosmoxHub utilities, this tool runs entirely in your browser. No data is ever sent to a server.