Dead Pixel Test

Cycle through pure solid colors in full-screen mode to easily spot hardware defects, stuck sub-pixels, or dead pixels on your display.

Ready to test your screen?

Select a color to start, or use Auto Cycle. Press ESC to stop.

Tip: Make sure your screen is clean before starting. Dust particles can often be mistaken for dead pixels.
Tap or use Arrow Keys to change color.
Press ESC to exit.
Popular device-specific tests
Windows 11Windows 10macOSiOSiPadOLEDPhoneAMOLEDLEDVA

Understanding Display Defects

When purchasing a new monitor, laptop, or smartphone, checking the display quality is a critical first step. Modern LCD and OLED panels contain millions of individual pixels, each made up of red, green, and blue (RGB) sub-pixels. Due to manufacturing complexities, a tiny percentage of these panels ship with microscopic anomalies known as dead or stuck pixels.

Dead Pixel vs. Stuck Pixel

Dead Pixels: A dead pixel occurs when the transistor powering it completely fails to supply power. This results in a permanently black dot on your screen. They are most visible against a pure white or bright background. Unfortunately, true dead pixels are permanent hardware defects and cannot be fixed with software.

Stuck Pixels: A stuck pixel happens when one or more of the sub-pixels remain permanently "on". This creates a stubborn, bright dot of a specific color that refuses to change. Unlike dead pixels, stuck pixels can sometimes be revived using rapid color-cycling software (like our Burn-in Fixer).

Brand-Specific Pixel Testing

Because our tool runs directly in your browser, it is universally compatible. However, depending on your brand's panel technology:

  • Asus & Dell (IPS): Somewhat prone to "stuck" pixels. Pay close attention during the solid black color test.
  • Apple (MacBook): Retina displays have incredibly high pixel density. Turn brightness to 100% and inspect on a solid white background.
  • Samsung & LG (OLED): OLED panels turn off individual pixels for black. Use pure white and primary color screens to check for unlit spots.

Frequently Asked Questions

Does this tool fix dead pixels?

No. This specific tool is strictly for diagnosing and locating defects by flooding the screen with pure colors. If you discover a stuck pixel, you can try our Burn-in Fixer tool to attempt to stimulate the pixel back to normal operation.

Does this test work on Asus, LG, and Dell monitors?

Absolutely. It works perfectly on Asus, Dell, Samsung, LG, Apple, and most other displays because the test is visual and browser-based.

How many dead pixels are acceptable for a warranty return?

Warranty rules vary by brand, model, region, and seller policy. Always check the official dead-pixel policy for your exact monitor or laptop model.

Can a dead pixel spread to other pixels?

Generally, no. A dead pixel is an isolated transistor failure and is not "contagious." However, if the screen suffered physical damage or internal pressure, you might see more pixels failing in the surrounding area over time.