Dead Pixel Test for Monitors & Screens
Test your monitor or laptop screen for stuck and dead pixels by cycling through solid colors. Works on any display.
Runs in your browser. No data leaves your device.
Frequently Asked Questions
How does the Dead Pixel Test work?
The tool renders a full-screen div element with a solid background-color CSS property that cycles through pure red (#FF0000), green (#00FF00), blue (#0000FF), white (#FFFFFF), and black (#000000). Each color tests a different subpixel channel on your LCD. Dead or stuck pixels fail to change with the rest of the display, making them visible as tiny dots that do not match the surrounding solid color.
How do I find dead pixels?
Go full screen and cycle through solid colors (red, green, blue, white, black). A dead pixel will appear as a tiny dot that stays dark on bright screens. A stuck pixel will appear as a colored dot on dark screens.
What is the difference between dead and stuck pixels?
A dead pixel is always off (appears black). A stuck pixel is always on in one color (appears as a bright red, green, or blue dot). Stuck pixels can sometimes be fixed with pixel-cycling tools; dead pixels usually cannot.
Should I test a new monitor for dead pixels?
Yes. Most manufacturer warranties cover dead pixels if there are more than a threshold number (often 3-5). Testing early lets you exchange or return the monitor within the warranty period.