Dead Pixel Test

Check any screen for dead and stuck pixels. This test cycles your whole display through solid red, green, blue, white and black — faulty pixels show up as dots that don't match. Works on any monitor, laptop, phone or TV.

Press start to fill the screen and auto-cycle the test colors. Use Pause to hold a color, the arrow keys to step through by hand, and Esc to exit. Look closely at each color for dots that stand out.

Test colors
Auto-advances every 2 seconds — pause any time.

How to Run the Test

The idea is simple: fill the screen with one flat color at a time so any pixel that behaves differently gives itself away.

1

Cycle the colors

Start the test and let it move through red, green, blue, white and black. Clean your screen first so dust isn't mistaken for a fault.

2

Spot the odd dot

A dead pixel stays black on every color, including white. A stuck pixel keeps showing red, green or blue when the background is a different color. Pause on a color to inspect an area.

3

Try to revive a stuck pixel

Leave the colors cycling over the spot for a while, or gently massage it with a soft cloth while the screen is on. Stuck pixels sometimes recover; a truly dead one usually won't.

Frequently Asked Questions

How does a dead pixel test work?
It fills your whole screen with solid colors one after another — red, green, blue, white and black. Against each flat color a faulty pixel stands out: a dead pixel stays black on every color, and a stuck pixel keeps showing one color when the background changes.
What's the difference between a dead pixel and a stuck pixel?
A stuck pixel is permanently lit in one color because a sub-pixel is fixed on, and it can sometimes be revived. A dead pixel receives no power and stays black on every color — including the white screen — and usually can't be fixed.
Can a stuck pixel be fixed?
Sometimes. Rapidly cycling colors over the area, or gently massaging the spot with a soft cloth while the screen is on, can occasionally free a stuck pixel. A truly dead pixel that stays black on white generally can't be repaired in software.
Is it dust or a dead pixel?
Wipe the spot gently — if it moves or disappears, it's dust or a smudge on the glass. If it stays fixed in exactly the same place across the color screens, it's a pixel fault.