Test your screen for dead or stuck pixels with full-screen solid colors, gradients, and a checkerboard pattern. Free, instant.
💡 For dead pixel checks, sit close to the screen and look carefully — a stuck pixel is a tiny dot that stays a fixed color regardless of what's displayed around it, most visible against solid colors.
This tool displays full-screen solid colors (red, green, blue, white, black, gray), a smooth gradient, and a fine checkerboard pattern — the standard set of patterns used to spot dead or stuck pixels, backlight bleeding, or uneven color reproduction on a display. Cycle through solid colors with the arrow keys or by clicking, and look closely for any small dot that stays a fixed color regardless of what's displayed behind it — that's typically a dead or stuck pixel. The gradient test helps reveal banding or uneven brightness, and the checkerboard pattern makes irregular or discolored squares easier to spot.
A dead pixel stays permanently black/dark, showing no color at all. A stuck pixel is fixed on a single color (often red, green, or blue) regardless of what the screen is displaying. Both are visible most clearly against solid, contrasting backgrounds.
Full-screen mode removes distractions (browser UI, other colors on the page) so the test pattern fills your entire display, making pixel issues easier to spot. Press Escape at any time to exit.
No — this tool only helps you identify pixel issues visually. Some stuck (not dead) pixels can occasionally be resolved with pixel-massage techniques or specialized software, but this tool is for detection only.