Dead Pixel Test

Test your screen for dead or stuck pixels. Click the area below to start the full-screen test. Instructions will be shown first, then click anywhere on the screen to cycle through colors.

Test Sequence: White → Black → Red → Green → Blue → Cyan → Magenta → Yellow → (Repeats). Press ESC to exit.

Dead vs. Stuck vs. Hot Pixels: What to Look For

Use our test to check for these common pixel defects.

Illustration of a black dead pixel on a white background.

Dead Pixels

These are pixels that remain permanently black. They are easiest to spot on a white screen.

Illustration of a bright colored stuck pixel on a dark background.

Stuck Pixels (Colored)

These pixels are stuck on a single color (Red, Green, or Blue). They are most visible on a contrasting background.

Illustration of a bright white hot pixel on a black background.

Hot Pixels (White)

These pixels are permanently white. They are easiest to spot on a black screen.

How to Use This Dead Pixel Test

  1. Prepare Your Screen: For accurate results, gently wipe your screen clean of any dust or smudges.
  2. Start the Test: Click the "Start Dead Pixel Test" area above. Your screen will go into full-screen mode.
  3. Follow Instructions: An instruction screen appears first. Click to dismiss it and begin the test with the first color.
  4. Cycle & Inspect: Click anywhere on the full-screen display to change to the next color. Carefully examine your entire screen for any pixels that look out of place.
  5. Exit Fullscreen: Press the 'ESC' (Escape) key on your keyboard at any time to exit the test.

Dead Pixels on Phones & TVs

The testing process is the same for virtually any screen. On a phone (iPhone or Android), start the test and look closely. You may need to zoom in if your screen has a high resolution. For TVs, open this page in the TV's web browser. Stand a comfortable distance away and cycle through the colors to check for any inconsistencies across the large display.

Dead Pixel Test: Frequently Asked Questions

A dead pixel is a pixel on a display that does not light up at all. It appears as a tiny black square or dot and is most easily seen against a light or white background. This usually means all three of its sub-pixels (red, green, and blue) are non-functional.

A stuck pixel is a pixel where one or more of its sub-pixels (red, green, or blue) are constantly active ("stuck on"). This causes the pixel to display a fixed color, such as red, green, blue, or even white (if all three sub-pixels are stuck on).

A dead pixel looks like a tiny black square on your screen. It's the size of a single pixel and is most noticeable on a solid white background, where it will stand out as a black dot that never changes color.

Dead pixels are typically permanent hardware failures and cannot be fixed. Stuck pixels, however, sometimes can be. Common methods include using software that rapidly flashes colors over the affected pixel or very gently massaging the area with a soft cloth (use extreme caution, as this can cause more damage). Success is not guaranteed.

A dead pixel is always black because it receives no power. A stuck pixel is always lit up in a specific color (like red, green, or pure white) because it is constantly receiving power.