Dead pixel test
Test your screen for dead, stuck, or defective pixels with multiple colors
Look carefully at your entire screen for any pixels that don't match the displayed color
Back to homeColor: White (1/9)
Click or press Space to change color
Dead pixel test
Test your screen for dead, stuck, or defective pixels with multiple colors
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What the dead pixel test checks
A dead pixel stays black because it does not light up. A stuck pixel stays lit in one color, often red, green or blue. Both are hard to see in everyday use, so this test fills your screen with one solid color at a time. Against a flat field, any pixel that does not match stands out. Run it on a new monitor, laptop or TV within the return period.
The test cycles through nine colors: white, black, red, green, blue, cyan, magenta, yellow and gray. Step through them by clicking, with the Space and arrow keys or with the number keys 1 to 9, or let auto-cycle change the color every 1, 2, 3 or 5 seconds. Press F to toggle fullscreen. Everything runs in your browser.
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How to check your screen for dead pixels
- Clean the screen so dust is not mistaken for a faulty pixel.
- Press F or use the fullscreen button so the color fills the whole display.
- Click or press Space to go to the next color, or press A to start auto-cycle.
- Scan each color slowly, edge to edge, and note any dot that does not match. A careful pass takes a few minutes.
- Press Esc to exit fullscreen when you are done.
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Dead pixel test FAQ
- What is the difference between a dead pixel and a stuck pixel?
- A dead pixel does not light up, so it shows as a black dot on white and other bright colors. A stuck pixel has one or more subpixels that stay on, so it shows as a red, green, blue or other colored dot and is easiest to see on black. A pixel that stays white on black is sometimes called a hot pixel.
- Can a stuck pixel be fixed?
- Sometimes. Some stuck pixels recover after rapidly flashing colors over the area for a while, but there is no guarantee. Dead pixels rarely recover. This test is made for finding faults: its auto-cycle changes color at most once per second, which is too slow to work as a pixel fixer. If a pixel stays faulty, check your warranty.
- How many dead pixels are acceptable?
- It depends on the manufacturer's pixel policy. Many brands replace a monitor only once a set number of dead or stuck pixels is reached, while some offer a zero bright pixel guarantee. Some policies refer to the pixel fault classes in ISO 9241-307. Check your warranty terms and test early in the return period.
- Does the dead pixel test upload anything?
- No. The test only paints solid colors on your screen. It runs in your browser, needs no permissions and cannot see your display, so nothing about your screen is measured or sent. You do the checking with your own eyes.
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