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Dead Pixel Test - Find Stuck & Dead Pixels on Your Screen

Check your monitor or LCD display for dead pixels and stuck pixels in the browser. Fullscreen display of 8 colors + grid + gradient for visual inspection.

Photosensitivity warning: This test displays fullscreen color changes that may rapidly flash when switching screens. If you have photosensitive epilepsy or have ever felt unwell from flashing screens, please do not use this tool.

Dead Pixel Test - LCD Monitor Screen Check

A free online tool to check your monitor or LCD display for dead pixels, stuck pixels, and bright spots right in your browser. Displays 8 solid colors (white, black, red, green, blue, yellow, cyan, magenta) plus grid and gradient patterns in fullscreen mode so you can visually inspect your entire screen. Use it to check new monitors for defects or verify used displays before purchase.

Dead Pixel Test

Check your monitor or LCD for dead pixels and stuck pixels in fullscreen mode.

Click a color below to display it in fullscreen. Use the Left/Right arrow keys to switch colors, and click or press Esc to exit.

How to Use

1Click a color button above to display it in fullscreen.
2Carefully inspect the entire screen for any spots that differ from the surrounding color.
3Use Left/Right arrow keys or Space to switch to the next color.
4Click the screen or press Esc to exit.
Tip: Dead pixels (dark spots) are easiest to find on a white screen, while stuck pixels (bright spots) show up best on a black screen. The red, green, and blue screens help identify sub-pixel level defects.

Why Test with 8 Colors?

Each pixel on an LCD display is made up of three sub-pixels: Red (R), Green (G), and Blue (B). The 8 colors correspond to all possible ON/OFF combinations of these three sub-pixels.

White (#FFF): R+G+B all ON -- reveals dead pixels (dark spots)
Black (#000): R+G+B all OFF -- reveals stuck pixels (bright spots)
Red, Green, Blue: Tests each individual sub-pixel for defects
Yellow, Cyan, Magenta: Two-color combinations for complementary checking

Frequently Asked Questions (FAQ)

Q. What is a dead pixel?
A. A dead pixel occurs when the pixel's transistor fails, causing it to remain permanently off. It appears as a dark spot on a white screen. This is usually caused by a manufacturing defect and generally cannot be repaired.
Q. What is a stuck pixel?
A. A stuck pixel has one or more sub-pixels permanently turned on, appearing as a bright colored dot on a black screen. Unlike dead pixels, stuck pixels can sometimes be fixed using tools that rapidly flash colors on the affected area.
Q. Can dead pixels be fixed?
A. Dead pixels (permanently off) generally cannot be repaired. Stuck pixels (permanently on) can sometimes be improved by rapidly cycling colors on the affected area. If your monitor is under warranty, you may be eligible for a replacement depending on the manufacturer's policy.
Q. My new monitor has a dead pixel. What should I do?
A. Check the manufacturer's dead pixel policy. Many manufacturers offer replacements if the number of dead pixels exceeds a certain threshold. We recommend testing your monitor with this tool as soon as you receive it.
Q. Can I use this on a smartphone or tablet?
A. Yes, as long as your device's browser supports the fullscreen API. However, the smaller the screen, the harder it is to spot dead pixels.
Q. What if fullscreen mode doesn't activate?
A. Your browser settings may be restricting fullscreen mode. Try pressing F11 manually or use your browser's fullscreen menu option. The test still works even without fullscreen mode.

This tool assists with visual inspection of monitors and displays. Display accuracy depends on your device and browser specifications.

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