How to use Dead Pixel Test
- Clean your screen so dust isn't mistaken for a faulty pixel.
- Tap Start full-screen test. Tap or press the space bar to move to the next colour.
- Look closely at each colour for dots that don't match. Press Esc or double-tap to exit.
Dead pixels and stuck pixels
A dead pixel stays black on every colour and is easiest to spot on the white screen. A stuck pixel stays one colour, such as red, green or blue, and shows up on the black screen. A hot pixel stays white and also shows on black.
Stuck pixels can sometimes be fixed by gently massaging the spot with a soft cloth while the screen is on, or by flashing colours rapidly over them. Dead pixels usually can't be repaired, so test a new screen while you can still return it.
Frequently asked questions
How many dead pixels are acceptable?
It depends on the manufacturer. Many monitor warranties only cover a replacement after several faulty pixels, so check your brand's pixel policy.
Does this work on phones and TVs?
Yes. Open this page on the device you want to test. On a smart TV, use its built-in browser.
Can this test damage my screen?
No. It only shows plain colours, like any other image.