SCREEN 📌 Quick Summary: A dead pixel test displays solid colors (white, black, red, green, blue) on your screen to help you identify dead, stuck, or malfunctioning pixels. This test is free, runs in your browser, and takes less than 60 seconds.
What is a Dead Pixel Test?
A dead pixel test is a diagnostic procedure that displays solid colors on your screen to reveal defective pixels. A dead pixel appears as a tiny black dot that never lights up, while a stuck pixel stays on a single color (red, green, blue, or white).
Our free online dead pixel test cycles through pure white, black, red, green, and blue screens in fullscreen mode. This is the same method used by display manufacturers and calibration professionals worldwide.
How to Test Your Screen for Dead Pixels
- Clean your screen first — Dust, lint, or residue can mimic a dead pixel.
- Click "Start Full Diagnosis" — The test will run in fullscreen mode.
- Inspect each color carefully — Look for any dots that don't match the background.
- Document any defects — Take photos if you plan to return the device.
Dead Pixel vs Stuck Pixel: What's the Difference?
Dead pixels are permanently black — they never light up. Stuck pixels remain on one color and can sometimes be fixed with rapid color cycling. Our test helps you identify both types.
For a complete comparison, read our guide: Dead Pixel vs Stuck Pixel: What's the Difference?
Which Devices Can Be Tested?
Our online dead pixel test works on any device with a modern web browser:
- Monitors — LCD, LED, OLED, 4K, 144Hz
- Laptops — Windows, MacBook, Chromebook
- Phones — iPhone, Android, Samsung
- TVs — Smart TVs with a browser
- Tablets — iPad, Android tablets
Why Test for Dead Pixels?
Most manufacturers won't replace a panel for just 1-2 dead pixels. That's why it's crucial to test your screen within the return window — whether you just bought a new monitor or you're buying a used one.
Read our full guide: What is a Dead Pixel? The Complete 2026 Guide.