Dead Pixel Tester
Fill your screen with solid colors to quickly spot dead or stuck pixels.
¿Qué es Dead Pixel Tester?
Dead Pixel Tester fills your entire screen with a single solid color so you can easily spot dead pixels (which stay black) or stuck pixels (which remain a fixed color). Cycle through red, green, blue, white, black, cyan, magenta, and yellow to check every sub-pixel on your display.
Cómo usar Dead Pixel Tester
- Click a color swatch to fill the preview area with that color.
- Click 'Test Fullscreen' to enter fullscreen mode for a complete screen-wide inspection.
- Scan your screen carefully for tiny dots that don't match the background.
- Use the arrow keys (or on-screen buttons in fullscreen) to cycle through colors.
- Press Escape or click the exit button to leave fullscreen.
Ejemplos
Sub-pixel fault detection
Entrada: Cycle through pure Red, Green, and Blue
Salida: A tiny black dot on any color indicates a dead sub-pixel for that color channel
Stuck pixel detection
Entrada: Pure Black screen
Salida: A colored dot on a black background is a stuck (not dead) pixel — these sometimes respond to color cycling
White uniformity check
Entrada: Pure White screen, dim the room
Salida: Look for yellow or grey patches that indicate backlight non-uniformity
Errores comunes
- Testing in a brightly lit room — ambient reflections make dead and stuck pixels much harder to see; dim the lights before testing.
- Only checking one color — some pixel faults affect only a specific sub-pixel (R, G, or B); always test all colors to find them.
- Confusing dust or fingerprints for dead pixels — clean your screen with a soft cloth before testing.
Por qué usar esta herramienta
- Works in any browser — no installation or download required.
- Fullscreen mode ensures every edge and corner of the display can be inspected.
- Keyboard navigation makes it easy to cycle colors with one hand.
- Fast to use — a full dead-pixel check takes under two minutes.