Dead Pixel Test – Free Screen Tester for Monitors

A dead pixel is a defective screen pixel that remains permanently black and fails to display any color. Unlike stuck pixels that show a fixed color, dead pixels occur when the transistor controlling that pixel has failed completely. Dead pixels are usually permanent defects and cannot be fixed with software solutions, though warranty coverage may apply for new monitors.

A stuck pixel is a screen defect where a pixel remains fixed on one color (usually red, green, or blue) instead of changing with the rest of the display. Unlike dead pixels, stuck pixels still receive power and may be recoverable using pixel-fixing tools that rapidly cycle colors to 'unstick' the liquid crystals. Our pixel fixer tool can help repair stuck pixels.

Click 'Start Screen Test' to enter fullscreen mode, then use keyboard shortcuts 1-0 or click to cycle through test colors. Examine your entire screen on each color to spot any pixels that don't match. Pay special attention to solid colors like white, black, and pure RGB. Press ESC to exit the test at any time.

Dead pixels are typically permanent hardware defects that cannot be fixed with software. However, our Stuck Pixel Fixer can help recover stuck pixels by rapidly flashing colors to encourage the liquid crystals to realign. Run the fixer for 10-20 minutes over the affected area. If pixels remain dead after testing, contact your monitor manufacturer for warranty support.

Yes, our dead pixel test works on mobile devices including smartphones and tablets. Simply open the test in your mobile browser and tap to cycle colors. For the best results, maximize brightness and test in a dimly lit room. The pixel fixer also works on mobile—use fullscreen mode for optimal coverage.

There are three main types: Black dead pixels (permanently dark, no power reaching the transistor), white dead pixels or hot pixels (all three sub-pixels fully lit, appears as a bright white dot), and colored stuck pixels (one or two sub-pixels stuck on, showing a fixed red, green, blue, cyan, magenta, or yellow dot). Stuck pixels are the most likely to be recovered with a pixel fixer tool.

Dead pixels are most commonly caused by a failed transistor connection that cuts power to the pixel (producing a black pixel), manufacturing defects in the panel, or physical damage from impacts or pressure. Power surges can also damage pixel circuitry over time. If you have a new monitor with dead pixels, it's likely a manufacturing defect covered by warranty.

True dead pixels (black, no power) generally don't spread—they are isolated transistor failures. However, physical damage that caused one dead pixel can sometimes affect neighboring pixels if the panel structure is compromised. Stuck pixels caused by trapped liquid crystals may occasionally resolve themselves or respond to the pixel fixer tool. Monitor your screen after finding a defect to track whether it worsens.

It depends on the manufacturer's pixel defect policy. Most manufacturers (Dell, LG, Samsung, etc.) define an acceptable threshold—typically 1 to 5 dead pixels before a warranty claim is honored. Premium monitors often have better policies (zero dead pixel guarantees). Always check your manufacturer's specific ISO 13406-2 or similar compliance policy and document defects with our test before contacting support.