Dead Pixel Test

Fill your screen with solid colors to spot dead or stuck pixels.

Loading Screen / Dead Pixel…

How to use Screen / Dead Pixel

Wipe the screen first so dust is not mistaken for a pixel fault.
Pick a color to fill the screen, then click or press Space or the right arrow to cycle colors.
Look for a dot that stays black on every color (dead) or keeps one color (stuck).
Press Esc to leave full screen.

About Screen / Dead Pixel

Fill your screen with solid color fields to hunt for dead and stuck pixels. Tap a color to go full-screen, then click or press the arrow keys to cycle through white, black, the primaries and the secondaries.

Against a flat field, faults are easy to spot: a pixel that stays black on every color is dead, while one stuck on a single color shows up clearly against its opposites.

What people use it for

Inspect a new monitor, laptop or phone for panel defects before the return window closes.
Tell a dead pixel (always off) from a stuck pixel (always one color).
Check for backlight bleed and uniformity on a black field.

Frequently asked questions

Dead vs stuck pixel?

A dead pixel stays black on all colors; a stuck pixel stays lit on one color. Stuck pixels sometimes recover; dead ones usually don't.

How do I exit?

Press Esc, or use the ✕ button in the corner of the full-screen view.

Is it private?

Every calculation happens on this page, in your own browser. Your input is never sent to a server and never logged, which also means the tool keeps working when you are offline.