How to use
- 1Clean the screen and turn the brightness up.
- 2Start the full-screen test, or start with a specific color.
- 3Click or press → / Space to go to the next color, ← to go back and Esc to exit; scan each color closely.
- 4If you find a stuck pixel, read the warning and run the stuck pixel fixer over it.
Dead, stuck and hot pixels
Each pixel is made of red, green and blue subpixels. A dead pixel stays black, so it stands out on white or colored backgrounds. A stuck pixel stays lit in one color — it shows up as a red, green or blue dot on the colors where it shouldn’t be. A hot pixel stays white and is easiest to see on black. Grey helps reveal uneven areas and faint dots. Looking at each color from a slightly different angle helps, and dust can be told apart by wiping the screen.
Using the stuck pixel fixer
The fixer flashes a square of rapidly changing colors. Drag it over the stuck pixel (choose 50×50, 100×100 or 200×200 px, or full screen) and let it run for 10–20 minutes, repeating if needed. Stuck subpixels sometimes recover this way; fully dead, always-black pixels usually don’t, because the transistor driving them has failed. The fixer only starts after you confirm the photosensitive epilepsy warning — do not use it if flashing light could affect you, and don’t stare at it.
Test a new monitor before the return window closes
Run the test as soon as you unpack a new monitor, laptop or TV, so you can still use the retailer’s return period. Manufacturers’ dead pixel policies differ: many follow ISO 9241-307 pixel fault classes and only replace a panel when a certain number of faulty pixels is reached, while some offer a zero-bright-dot guarantee. Note the position of any faulty pixel and take a photo before contacting support.
Frequently asked questions
How do I check for dead pixels?
Run the full-screen test and look closely at each color. A black dot on white or colored screens is a dead pixel; a colored or white dot on black is a stuck or hot pixel.
Can a dead pixel be fixed?
A completely dead (black) pixel usually can’t. A stuck pixel showing one color can sometimes be revived by running the flashing fixer over it for 10–20 minutes.
Does this work on phones and TVs?
Yes, on any device with a browser. On a TV, open the page in the TV browser or cast a full-screen browser tab.
How many dead pixels are acceptable?
It depends on the manufacturer’s policy. Many allow a few faulty pixels before replacing a panel, so check your warranty terms and the store’s return policy.
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