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Check your screen for dead or stuck pixels in one click. Full-screen solid color tests: black, white, red, green, blue & more. Find dead and stuck pixels on your screen in under a minute — no downloads, no sign-up, no permissions. Dead Pixel Test turns your entire screen into a solid block of color so defective pixels have nowhere to hide. A pixel that stays black on every color is dead. A pixel frozen on red, green, or blue is stuck — and stuck pixels can often be revived for free. WHY YOU'D WANT THIS • Just bought a monitor, laptop, or TV? Test it while you're still inside the return window. Most retailers give you 14–30 days — a defect found on day 3 is a free replacement, found on day 40 it's a warranty argument. • Buying second-hand? Run the test before you hand over money. It takes one click. • Spotted a suspicious dot? Find out in seconds whether it's a dead pixel, a stuck pixel, or just dust (they look almost identical — the test tells them apart). HOW IT WORKS 1. Click the icon and hit "Start full test" — your screen goes fullscreen black. 2. Click or use arrow keys to step through 7 test colors: black, white, red, green, blue, yellow, and gray. 3. Scan the whole screen on each color. Any dot that doesn't match the background is a pixel defect. Each color catches a different fault: white reveals dead (dark) pixels, black reveals stuck (lit) pixels, and red/green/blue isolate each sub-pixel so you can tell exactly which one failed. Gray checks panel uniformity. FEATURES • One-click fullscreen test — no setup • 7 solid test colors, or jump straight to any color from the popup • Auto-cycle mode: press A and the colors change every 3 seconds while you inspect • Full keyboard control: arrows to step, Esc for help, Q to quit • Works on any screen your browser runs on — monitors, laptops, external displays • Requests zero permissions and collects no data FOUND A DEFECT? IT MIGHT BE FIXABLE A stuck pixel (one frozen on a color) can often be revived by rapidly cycling colors over it for 10–20 minutes. The free fix tool at deadpixeltest.pro/fix/ does exactly that. A truly dead pixel can't be fixed by software — but depending on how many you have and where they are, your panel may qualify for a warranty replacement. The guides at deadpixeltest.pro cover the pixel policies for Samsung, LG, Dell, Apple, ASUS, and more. Built by deadpixeltest.pro — the free online dead pixel test and repair toolkit.