Dead Pixel Test

Open the tool, enter fullscreen mode, and cycle through the solid colors (black, white, red, green, blue). Inspect your screen for pixels that do not change color. Dead pixels will appear as black or white dots, while stuck pixels will remain fixed on a single color.

Connect your monitor to a device with a browser, open this tool, and enter fullscreen mode. Cycle through the colors and look for pixels that do not match the background. For best results, test in a dark room and view the screen from different angles.

Open this tool in your mobile browser (Safari for iPhone, Chrome for Android), enter fullscreen mode, and cycle through the colors. Zoom in if necessary to inspect the screen closely. Dead or stuck pixels will appear as dots that do not change with the background.

A dead pixel is permanently off (black) or stuck on white and does not respond to input. A stuck pixel is frozen on a single color (red, green, blue, etc.) due to a sub-pixel malfunction. Both are defects, but stuck pixels are sometimes fixable with tools like JScreenFix.

No, this tool is for detection only. While stuck pixels can sometimes be fixed using rapid color cycling (e.g., JScreenFix), dead pixels are usually permanent and require screen replacement. Use this tool to confirm defects before seeking repairs or warranty claims.

Yes, the tool works on any device with a modern browser, including desktops, laptops, tablets, and smartphones. For best results, use a browser that supports fullscreen mode (Chrome, Firefox, Safari, Edge).

The magenta dots highlight pixels that deviate from the expected solid color. These are potential dead or stuck pixels. Manually verify them by cycling through colors, as automatic detection may flag false positives (e.g., dust or screen artifacts).

The automatic detection is ~90% accurate for obvious defects but may miss subtle issues or flag false positives. For critical use (e.g., warranty claims), manually inspect the screen by cycling through colors in a dark room.

No, the tool tests the primary display in fullscreen mode. To test a secondary monitor, move the browser window to that screen before entering fullscreen. For multi-monitor setups, test each screen individually.

If your device is under warranty, contact the manufacturer for a replacement. For stuck pixels, try using a pixel-fixing tool like JScreenFix. If the defect is minor and out of warranty, you may choose to ignore it, as most screens have a few imperfections.

Yes, this tool is completely safe. It only displays solid colors and does not emit harmful signals or modify your hardware. However, prolonged use of bright colors (e.g., white) may cause temporary image retention on OLED screens.

Yes, but be aware that OLED screens are more susceptible to burn-in. Avoid leaving static colors (e.g., white or red) on the screen for extended periods. Use the tool briefly to check for defects, then switch to varied content.

Some pixels may take time to reveal defects, especially stuck pixels. Cycle through colors multiple times and inspect the screen for at least 5–10 minutes to catch intermittent issues.

Yes! Once loaded, the tool runs entirely in your browser with no internet connection required. Bookmark the page to use it offline anytime.

Press the Esc key on your keyboard or click the "Exit Fullscreen" button in the tool. On mobile, tap the fullscreen exit icon in your browser’s UI.