Fill your screen with pure colors, gradients and moving bars so single dead or stuck pixels stand out against a flat field.
The test only paints colors on your screen. No camera, no microphone, no storage, no network — nothing to leak.
Tap or press any key to advance · press 1–8 to jump to a color · press Esc to exit
A bad pixel is invisible in ordinary content and obvious on a flat field, so the test paints pure colors across your whole display: eight solids (white, black, red, green, blue, yellow, cyan, magenta) held for three seconds each, or a sweep mode with a scrolling full-spectrum gradient and moving black bars. Any single dot that disagrees with its background pops out at a glance — press keys 1 to 8 during solid mode to jump straight to a color, and tap or press any key to advance early.
A truly dead sub-pixel (always black, on every color) usually stays that way — the transistor or connection has failed. A stuck pixel (always red, green or blue) is a sub-pixel pinned at full brightness, and some of those do free themselves over time or with the moving-bar mode gently running for a while. Nothing here promises a repair, and pressing hard on the panel is best left alone — it fixes some panels and cracks others.
Depends on the warranty terms, not on the count alone. Flat panels are sold under defect classes (the ISO 9241-307 family and manufacturer policies), and many consumer warranties tolerate a small number of defects depending on type and position — a single dead pixel in the center often qualifies, one in the corner may not. Check your brand's pixel policy before opening a claim, and take photos on each solid color as evidence.
No — this page only paints colors. Camera and microphone checks live on a separate tool, the Camera & Mic Test, which walks through permissions, device pickers and a level meter.
There is no maintenance schedule — run it when you suspect something (after a transport, a drop, or when a new speck shows up in the same spot across every image). A quick 25-second sweep is enough; most new 'dead' spots turn out to be dust on the glass, so clean the screen first.
No. The test draws colors with a local canvas and CSS — no network request, no storage, no permission of any kind. Once the page is loaded it works fully offline, including full screen.
If you just finished with Dead Pixel Test, the natural next steps are Screen Resolution Checker, Keyboard Tester, Metronome, or browse every tool in Daily Tools.