Dead Pixel Test
Fill your screen with one solid color at a time and look for pixels that keep the wrong color - the quickest way to find dead and stuck pixels on a monitor, laptop, phone or TV.
How the test works
- Wipe the screen with a dry microfiber cloth. Dust and smudges look a lot like a stuck pixel.
- Start the test. The page covers your whole screen with one solid color.
- Click, tap or press the arrow keys to move through white, black, red, green, blue and gray. Scan the corners and edges too, not only the middle.
- Press Esc when you are done to read what your findings mean.
When to run it
- On a new monitor, laptop, phone or TV, while you can still return it.
- On a used or refurbished screen, before you hand over the money.
- Before a warranty claim, so you know how many defects there are and where they sit.
Found a colored dot that sits in the same place on every color? That is a stuck pixel, and fast color noise is the free thing to try before anything else.
Try the dead pixel fixer on a stuck pixelFrequently asked questions
What is the difference between a dead pixel and a stuck pixel?
A stuck pixel keeps one subpixel switched on, so it shows up as a bright red, green, blue or white dot. A dead pixel gets no power at all and stays black on every color, including white.
Why does the test use so many colors?
A dark defect only stands out on white or another light color, and a bright defect only stands out on black. Gray also reveals faint subpixel faults that pure colors hide.
Does this work on a phone or a TV?
Yes. Any device with a browser works. On an iPhone the browser cannot take over the whole screen, so the test fills the page instead and the outer edge of the display stays behind browser chrome.
How many dead pixels are acceptable?
There is no universal number. Every manufacturer sets its own pixel policy, usually as a class or grade that allows a certain count of bright, dark and subpixel faults, and often a stricter count near the middle of the panel than at the edges. Larger screens are commonly allowed more. So the answer for your screen is whatever the policy for that model says, and the time to read it is while the device is still in warranty.
Do dead pixels go away?
A dead pixel does not. It gets no power at all, so nothing in software can reach it and only a panel replacement removes it. A stuck pixel is a different fault: one subpixel is jammed on, and those sometimes settle by themselves or after fast color cycling. That is what the pixel fixer is for, with no promise that it works.
Is anything uploaded or recorded?
No. The test is your own browser painting colors on your own screen. Nothing is captured and nothing leaves your device.