FREE · DEVICE TESTS
Dead Pixel Test.
Find dead and stuck pixels by filling your screen with solid colors in full screen. Manual or automatic color cycle, no flashing.
Clean the screen, open full screen and look closely at each solid color for dots that do not match.
A dot that stays black on every color is a dead pixel; a dot that keeps one color is a stuck pixel. Dust moves when you wipe the screen. This test does not repair pixels and uses no rapid flashing.
Click or → next · ← previous · Esc exit
How to use Dead Pixel Test
Clean the screen, open full screen, then click or use the arrow keys to cycle through black, white, red, green, blue, cyan, magenta, yellow and gray. Look for dots that do not match the color. Press Esc to exit.
How it works
Each color fills the whole display at full intensity. Automatic mode changes color every 3 seconds; there is no rapid flashing. The cursor and instructions hide after a moment so they are not mistaken for a defect.
Example
A dot that stays black on white and colored screens is a dead pixel; a dot that remains bright red on black is a stuck subpixel.
Questions about Dead Pixel Test
Is Dead Pixel Test free, and do I need an account?
Yes. This tool is free to use in your browser without an account. Processing takes place on your device.
What are the limits and what should I check?
Visual inspection only: the browser cannot detect defective pixels automatically, and this tool does not repair stuck pixels. Full screen depends on browser support; where it is unavailable, such as on iPhone, the colors fill the page instead. Review the result before using it in your work.
Is my input sent to a server?
Your input is processed in your browser and is not uploaded by this tool. Files and pasted text are cleared when the page is refreshed. Normal website requests are still required to load the page and its libraries. Read the privacy explanation.