Run the same screen checker below, but focus on pixels that stay lit in one color while the background changes.
Screen Tester is a free, browser-based screen testing tool that lets you find red, green, blue, or white pixels that stay lit on a display.
A stuck pixel test helps you find pixels that remain lit in one color, usually red, green, blue, or white, even when the rest of the display changes. These defects are easier to diagnose on solid RGB screens than on busy desktop backgrounds.
This page uses the same browser-based screen tester as our main display tool, but it targets the specific search problem people have when they notice a bright colored dot on a monitor or laptop panel.
If the pixel never lights at all, return to the dead pixel test to confirm the defect type.
Sometimes. A stuck pixel may improve after gentle pixel exercise methods or extended use, especially if the problem is limited to one sub-pixel channel. This page is useful before and after any attempted fix because you can retest the screen on the same set of solid colors.
If the defect never changes across bright and dark screens, it may be a dead pixel instead of a stuck one.
Stuck pixels often appear red, green, blue, or white because one or more sub-pixels remain active when they should change with the rest of the screen.
Yes. Full-screen mode removes browser bars and distractions so you can inspect the whole panel, including edges and corners.
No. Backlight bleed is a larger glow or uneven brightness pattern, while a stuck pixel is a tiny single-pixel or sub-pixel defect.
