Dead pixel and screen test
Solid full-screen colors make dead and stuck pixels easy to see. Step through them with a click or the arrows.
Runs on your device. Nothing is uploaded.A dead pixel stays black on every color. A stuck pixel stays one color whatever is on screen.
The colors run black, white, red, green, blue, grey, then a black-to-white gradient. Nothing flashes or changes on its own: you move on with a click, Space, Enter or the arrow keys.
Press Start full-screen test when the screen is ready.
| Screen, CSS pixels | — |
|---|---|
| Device pixel ratio | — |
| Estimated physical resolution | — |
| Color depth | — |
| Browser window, CSS pixels | — |
The physical resolution is an estimate: screen width times device pixel ratio. Browser zoom can change the ratio.
How to check a screen for dead pixels
- Press Start full-screen test and allow full screen if your browser asks.
- Move on with a click, Space, Enter or the right arrow, and go back with the left arrow.
- Look for a spot that stays black or stays one color. Press Esc when you finish.
Questions
What is the difference between a dead pixel and a stuck pixel?
A dead pixel stays black on every color, so it is switched off. A stuck pixel stays one color, such as red, green, blue or white, whatever the screen shows. Both are easiest to see on the solid colors.
Can a dead or stuck pixel be fixed?
Dead pixels usually cannot be repaired. Stuck pixels sometimes recover after the screen has been on for a while, but results vary. Pressing on a screen can damage it and may void the warranty, so check the warranty first.
Why does the test not fill the whole screen?
Some browsers only go full screen when you press the button yourself, and some refuse it. If full screen is refused, the colors still cover the page area, but the browser’s tabs and address bar stay visible. Press Esc to exit.
Does this test save anything?
No. The screen figures are read from your browser and shown only on this page. Nothing is saved or sent.