Dead Pixel Test
Fill your whole screen with one solid colour at a time. Faulty pixels that are invisible against a normal desktop stand out immediately against plain red, green, blue, white and black.
Start the test
Once in full screen: click or press → for the next colour, ← to go back, and Esc to come back here.
Or jump straight to one colourWhat you are looking for
Dead pixelAlways black. Stays black on white and on every colour. Usually cannot be fixed.
Stuck pixelAlways one bright colour. Shows up clearly on a black screen. Often fixable with the flicker tool.
Hot pixelAlways white. Visible on black and on the darker colours.
Backlight bleedPale glowing patches at the screen edges on a black screen. Common and mostly harmless.
Uneven backlightPatchy brightness across the 50% grey screen. Normal in small amounts.