Dead Pixel Test
Spot dark, bright, or stuck spots on your screen. This fullscreen test cycles through solid colors so dead and stuck pixels stand out immediately. Runs entirely in your browser.
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Dead Pixel Test: find dead and stuck pixels yourself
This dead pixel test fills your screen with solid colors one after another, so dark, bright, or stuck pixels stand out immediately. It runs in fullscreen and you move through nine solid colors with a click or the Enter key: red, green, blue, white, black, gray, cyan, magenta, and yellow. After the last color the test ends automatically. Everything runs entirely in your browser and no data is sent anywhere.
Why a pixel test is useful
A dead pixel never shows a color and stays dark. A stuck pixel stays in a single color or responds slowly. On a new screen or monitor, the test helps you spot such flaws early, while the warranty or return window is still valid. That applies to screens, monitors, and laptops alike.
How to run the test correctly
- Clean the screen first so dust or dirt does not look like a pixel.
- Look at each color from a normal distance and once from close up.
- Use even room lighting, as reflections distort the image.
- Note where you spotted a pixel, for example the screen coordinates.
What the individual colors mean
Dark pixels stand out best on white and light gray, while bright pixels stand out on black. Stuck pixels that stay in one color become visible on the opposite color. That is why the test shows several colors in sequence rather than just one.
Frequently asked questions
What is a dead pixel?
A dead pixel stays permanently dark and shows no color regardless of the image. A stuck pixel, by contrast, stays in a single color or responds with a delay.
How do I end the test?
The test runs through nine solid colors. After the last color, yellow, it ends automatically. You can end it early at any time with the Escape key.
Are my data uploaded?
No. The test runs fully in your browser. Neither screen data nor any other information is sent to a server.
What can I do if a pixel is found?
For a new device, check warranty and return options. For isolated stuck pixels, some software with rapid color cycling can help, though it is not guaranteed to work.
Does the test detect very fine pixels?
The test shows flat solid colors, so individual deviating pixels stand out well. At very high resolutions a magnifier or a look from close up can help further.