Dead Pixel Test.
Check your screen with five solid colors. Look for unusual dots as you switch each color manually.
Test colors
Manual steps onlyUse ← and → to change color. Pure RGB values only; dimming and light tones are disabled.
A slow, manual screen check.
- Open full screen at a comfortable device brightness.
- Look over the display for points that stay dark, bright or a different color.
- Use the buttons or left and right arrow keys to step through white, black, red, green and blue. Move the pointer or tap to reveal controls.
If you notice a mark, distinguish surface dust from a possible pixel issue. Follow the display manufacturer’s advice before cleaning. A mark alone is not a diagnosis; consult the manufacturer if you are unsure.
This tool does not detect faults automatically, repair pixels, calibrate your display or prevent OLED burn-in. There is no automatic cycling or flashing mode.
Questions, answered.
Why use several colors?
A point may stand out on one background and blend into another. Comparing white, black and the primary colors helps you inspect it manually.
Are dimming and warm tones applied?
No. This test always starts with pure white and uses exact RGB values for all five test colors. Lighting adjustments from other pages do not carry over.
Can it repair a dead pixel?
No. It only displays test surfaces. Ask your display manufacturer about diagnosis and warranty options.
How do I leave full screen?
Press Escape or move your mouse or touch the screen to reveal Exit. Press F to toggle full screen when you are not typing in a field.
Does it work on phones and tablets?
Yes. If your browser cannot open true full screen, the color fills the browser window instead. Browser bars may remain visible. You can use portrait or landscape orientation.