You unbox a new monitor or phone and want to make sure every pixel works before the return window closes. This tool auto-cycles through a sequence of full-screen colors — white, black, pure red, pure green, pure blue, a smooth grayscale gradient, and a high-contrast checkerboard — so you can scan every inch of your screen for dead, stuck, or dim pixels. Set the auto-advance speed to your liking, or step through manually with previous/next buttons. If you find a stuck (not dead) pixel showing a constant color, start the rapid-flash fix mode: it pounds through white, black, and primaries at high speed in an attempt to unstick the liquid crystal. Run it for 5–10 minutes and check again. It's not a magic cure, but it works often enough to be worth trying before you file for a replacement.
A dead pixel is permanently black — it never lights up. A stuck pixel shows a single color (red, green, blue, or white) because one subpixel is frozen in the 'on' position. Stuck pixels can sometimes be fixed with the rapid-flash mode on this page.
It rapidly cycles through white, black, red, green, and blue at high speed. The theory is that the fast color switching can unstick a frozen subpixel by repeatedly exercising the liquid crystal layer. Run it for 5–10 minutes and check again.
Test white and black to spot any pixel that's permanently off or on. Then test solid red, green, and blue to check each subpixel individually. The gradient and checkerboard patterns help identify subtle issues like stuck subpixels or uneven brightness.
Each link opens instantly in full screen. White and black are the most searched, but green, blue and pink are popular for video and streaming setups.
Adjustable-color full-screen light for video calls — dial in the perfect color temperature to look natural on camera.
Create a custom-colored glow ring around your webcam window — softer than a solid fill and mimics a physical ring light.
Instant max-brightness white fill — turns your screen into a portable flashlight for finding things in the dark.
Convincing cracked-screen overlays — pick from spiderweb, shatter, glitch, or LCD bleed styles to prank a friend.
Classic Windows, macOS, or Linux-style fake update screens — lock the display and watch coworkers think you're updating.
Animated TV static with a bouncing NO SIGNAL overlay — convincing enough to make someone check the cables.