Choose Test Color

Click a color to enter fullscreen mode. Carefully inspect the screen for abnormal pixels. Click anywhere or press ESC to exit.

Custom color:

Instructions

1. Dim the room lights for best results
2. Click a color button above to enter fullscreen
3. Carefully look for abnormal pixels:
• Bright/Stuck pixels — visible on black background
• Dark pixels — visible on white background
• Dead pixels — always show the same color
4. Test all colors for a thorough check
5. Click the screen or press ESC to exit fullscreen

FAQ

What is a dead pixel?

A dead pixel is a pixel on a screen that remains a fixed color regardless of the image displayed. It can be a bright pixel (always lit), a dark pixel (always off), or a stuck pixel (showing one color).

Can dead pixels be fixed?

Physical dead pixels are usually permanent. However, some stuck pixels may be revived by rapidly cycling through colors. Open a new browser window with this tool and quickly switch between colors a few times.

How many dead pixels are acceptable?

ISO standards allow a certain number of dead pixels depending on the display class (typically 3-5 per million pixels). Professional monitors aim for zero dead pixels. Contact your manufacturer if you're concerned.

Tips for accurate testing

Test in a dimly lit environment, set brightness to 50-80%, and inspect the screen from 30-50cm distance. Check black background for bright pixels and white background for dark pixels.

🖥️ Dead Pixel Test