Dead Pixel Test — Find Dead & Stuck Pixels
Check your screen for dead or stuck pixels with fullscreen solid colors — white, black, red, green, blue and more. Click to cycle colors, Esc to exit. Runs locally — no data is collected or uploaded.
🔒 Runs entirely in your browser. Your input and output are never sent to a server or stored — fully private.
- The screen fills with a solid color. Click or press any key to cycle: white → black → red → green → blue → yellow → cyan → magenta.
- On each color, scan the whole screen. A pixel that stays black on bright colors is a dead pixel; one stuck on a single color is a stuck pixel.
- Press Esc at any time to exit. The test ends automatically after the last color.
🔒 Everything runs locally in your browser — no data is collected or uploaded.
About this tool
A dead pixel can hide for months until the right colour fills the screen. This test cycles your display through fullscreen solid colours — black, white, red, green and blue — so a faulty pixel stands out against a perfectly uniform backdrop. A dot that stays dark on every colour is dead; one glowing a fixed colour is stuck. Run it while a new monitor can still be returned, or before buying a second-hand laptop, TV or phone. The page simply paints colours in your browser; nothing about your screen is measured, collected or uploaded.
Frequently asked questions
What is the difference between a dead pixel and a stuck pixel?
A dead pixel receives no power in any of its subpixels, so it stays black on every background and is easiest to spot on the white screen. A stuck pixel has one or more subpixels frozen on, showing as a red, green, blue or white dot that is most visible on black. The distinction matters: stuck pixels sometimes recover on their own or with treatment, while dead pixels are almost always permanent hardware failures.
Can a stuck pixel be fixed?
Sometimes. Stuck pixels occasionally recover on their own after hours or days of normal use, and rapidly cycling colours over the affected area can encourage the frozen subpixel to start switching again. Some people gently massage the spot with a soft cloth while the screen is on, though this risks causing further damage, so proceed carefully. Dead pixels rarely come back — check your manufacturer's pixel-defect policy instead, since many will replace a panel above a certain defect count.
How should I run the test to get a reliable result?
Clean the screen first — a speck of dust is the most common false alarm, and unlike a real defect it moves when wiped. Use fullscreen mode, dim the room lights while inspecting the black screen and use normal light for the white one, then work slowly across the panel section by section. The test runs entirely locally in your browser: it just fills the screen with colour, and nothing about your display is collected or uploaded.