Fullscreen5 test colors

Dead Pixel Test

Fill your screen with one solid color at a time and look closely for dots that don’t match. You do the looking: a web page cannot detect faulty pixels automatically.

Tap or press → for the next color, Esc to exit.

How to use

How to use the dead pixel test

Wipe the screen with a dry microfiber cloth. Dust is the most common false alarm.
Turn brightness up and dim the room lights if you can.
Press Start fullscreen test. The screen fills with black, and a note at the top tells you what to look for.
Step through the five colors by tapping the screen or pressing →. Scan the screen in sections, corners included.
Check anything suspicious up close: does the dot appear on every color or just some? Then press Exit or Esc.

Controls

Tap / click: Next color. Also brings the controls back.
→ Space: Next color.
←: Previous color.
Esc / Exit: Leave the test.
Color tiles: Start the test at that color.

Controls fade after a couple of seconds so they don’t hide any pixels. Nothing flashes or changes on its own.

In-depth guide: Dead pixel vs stuck pixel

What you might see

Dead pixel

Stays dark on every color, and is most obvious on the white screen.

Stuck pixel

Stays lit in one color, often red, green or blue, and is easiest to see on the black screen.

Bright or hot pixel

Stays white or very bright, and stands out on black.

Dust or a scratch

Changes or blurs when you wipe the screen or look from a different angle. It is not a pixel fault.

If you find one

Note its position and which colors it shows on, and take a photo if you can. Manufacturers and retailers set their own rules for how many faulty pixels qualify for a return or warranty repair, so check their pixel policy and your return window.

On a phone or laptop with touch, you can also run the touch screen test to check that the same area responds to touch, and the screen color test to look at uniformity and banding.

Limitations

This page shows solid colors; it does not read anything from your display hardware and cannot detect faults for you.
Night-shift, blue-light filters, HDR, and color or contrast settings change how colors look. Turn them off for the most even result.
Phones and tablets may keep a status bar or rounded corners visible, and some browsers don’t allow true fullscreen. On those, the test fills the browser window instead.

Questions

Can a stuck pixel be fixed?

Sometimes a stuck pixel clears on its own, and some people try rapidly flashing color tools. Results are inconsistent and this site does not provide one. Rapid flashing can also be uncomfortable or unsafe for people with photosensitivity. If a pixel matters to you, contact the manufacturer or retailer.

Does this work on a TV?

Yes, if the TV has a web browser or you mirror or connect a computer to it. Make sure the picture is not zoomed or overscanned, or the edges won’t be visible.

Test kit