Dead Pixel Test — Check Your Screen
Check a new monitor, TV, laptop or phone screen for dead and stuck pixels. Go full screen and step through solid colors; any dot that stays a different color is a problem pixel.
Stuck pixel fixer
Warning: the fixer flashes rapidly changing colors. Do not use it if you or anyone nearby has photosensitive epilepsy or is sensitive to flashing light.
How to check for dead pixels
- Clean the screen first so dust isn't mistaken for a pixel defect.
- Click Start, then step through the colors with a click or the arrow keys.
- Look closely across the whole screen on each color. Press Esc to exit.
Dead, stuck and hot pixels
A dead pixel stays black on every color, most visible on the white screen. A stuck pixel is lit in one color (often red, green or blue) and shows up on the black screen or on contrasting colors. A hot pixel stays white. The black screen also reveals backlight bleed around the edges of LCD panels.
Stuck pixels can sometimes be revived by rapidly cycling colors over them for 10–30 minutes, which is what the fixer does; place the small flashing window over the stuck pixel. Dead pixels usually cannot be fixed by software.
Check your manufacturer's pixel policy soon after purchase. Many brands replace a monitor only above a certain number of defective pixels, while some offer zero-dead-pixel guarantees, and return windows are often short.
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Frequently asked questions
What is the difference between a dead and a stuck pixel?
A dead pixel is always black; a stuck pixel is stuck on a color such as red, green or blue.
Can a stuck pixel be fixed?
Sometimes. Running the flashing fixer over it for 10–30 minutes, or gentle pressure with a soft cloth while the screen is off, can work.
Can I use this on a phone or TV?
Yes. Open the page in the device's browser and start the full-screen test.
Is one dead pixel normal?
Many manufacturers consider a few defective pixels acceptable; check your warranty's pixel policy.