Dead Pixel Test
Find dead or stuck pixels on any screen.
The test fills your whole screen with one solid colour at a time. Look closely for dots that stay black on white (dead pixels) or stay one colour on every screen (stuck pixels).
In the test: click or press → / Space for the next colour, ← to go back, Esc to exit.
About this tool
Dead Pixel Test fills the screen with black, white, red, green, blue and other solid colours, one at a time. Faulty pixels stand out clearly against a single colour, which makes this a quick check for a new or second-hand screen.
How to use Dead Pixel Test
- Clean the screen and press Start full-screen test.
- Click or press the arrow keys to move through the colours.
- Look for dots that stay black or one colour, then press Esc to exit.
Questions people ask
What is the difference between a dead and a stuck pixel?
A dead pixel stays black on every colour because it gets no power. A stuck pixel stays lit in one colour, such as red, green or blue.
Can a stuck pixel be fixed?
Sometimes. Rapidly flashing colours over the spot for 10–20 minutes, or gently pressing on it with a soft cloth, can free a stuck pixel. Dead pixels usually cannot be fixed.
How many dead pixels are acceptable?
It depends on the manufacturer. Many follow ISO 9241-307 classes, which allow a few faulty pixels on a Class II panel. Check the warranty terms for your model.