Dead Pixel Test
Fill your screen with solid colors to find dead, stuck or hot pixels and backlight bleed. Works on monitors, laptops, TVs and phones.
Controls: click / tap or press → / Space for the next color, ← for the previous one, Esc to exit.
Or pick a color
Stuck pixel fixer
How to check your screen for dead pixels
- Wipe the screen with a soft dry cloth so dust isn't mistaken for a dead pixel.
- Press “Start full-screen test” and step through the colors.
- On black, look for bright dots (stuck or hot pixels) and light leaking from the edges (backlight bleed).
- On white, look for black dots (dead pixels).
- On red, green and blue, look for dots of a different color (stuck subpixels).
Dead pixel policies
Most manufacturers only replace a monitor if it has more than a certain number of bad pixels — often 3–5 bright or dark dots — under the ISO 9241-307 class system. A single dead pixel may not qualify for warranty, but many stores accept returns within 14–30 days for any reason. Test new screens on the first day.
Fixing a stuck pixel
Drag the small fixer box over the stuck pixel and let it run for 10–30 minutes. The rapid color cycling exercises the liquid crystals and often revives stuck subpixels. If the pixel still won't change after a few attempts, it is likely dead and needs a warranty repair.