Dead Pixel Test

Click 'Start Test' to enter full-screen mode. Click anywhere or press ESC to exit. Use the color buttons to check for dead, stuck, or hot pixels.

About Dead Pixel Test

Last updated: 25 August 2026

Fills the screen with solid colours so you can inspect it for dead or stuck pixels — the small permanent dots that a normal desktop background hides.

Dead, stuck and how to tell them apart

A dead pixel receives no power and stays black on every colour. A stuck pixel is permanently lit in one colour, so it shows as a bright red, green or blue dot against black and disappears against its own colour. The distinction matters: stuck pixels sometimes recover, dead ones do not.

How to run the test properly: clean the screen first — dust reads as a dead pixel. Then step through black, white, red, green and blue full-screen, checking each. Black reveals stuck pixels; white reveals dead ones and dust; the primaries reveal a subpixel failure where only one of the three channels has failed.

Can a stuck pixel be fixed?

Sometimes. Rapidly cycling colours in that area can occasionally unstick it, and gentle pressure with a soft cloth while the screen is off is a widely repeated remedy with mixed results. Neither is guaranteed, and pressing hard risks damaging more of the panel than you started with.

How many faults are considered acceptable?

More than most buyers expect. Manufacturers follow the ISO 9241-307 class system, and most consumer panels are class II — which permits a small number of faulty pixels before a warranty claim is accepted. Test a new screen within the return window, because the return policy is usually more generous than the warranty.