Free Dead Pixel Test
Full-screen colours to find dead or stuck pixels.
What is the Dead Pixel Test?
A single bright dot that never goes dark, or a spot that stays black no matter what's on screen, is the kind of flaw you only notice after the return window closes. This dead pixel test floods your screen with solid colours so faults have nowhere to hide — ideal for checking a new monitor, laptop, phone or tablet.
It runs full-screen in your browser, with nothing to install and nothing uploaded.
Last updated: Aug 27, 2026
What does this tool do?
It fills your entire display with one solid colour at a time — black, white, red, green, blue and more — so any pixel that doesn't match the field stands out. You step through the colours by tapping or with the arrow keys, inspecting for pixels that are stuck on, stuck off, or discoloured, as well as backlight bleed and uniformity issues.
Because a healthy screen shows a perfectly even field, anything that breaks the pattern is worth a closer look.
Key features
Full-screen fields
Solid colours edge to edge.
Full colour set
Black, white, RGB and more.
Quick cycling
Tap or arrow-key through colours.
Any device
Monitor, laptop, phone or tablet.
Private
Runs entirely in your browser.
Example
Common use cases
- New-device buyers — Inspect a screen before the return window closes.
- Used-gear shoppers — Check a second-hand monitor or phone.
- IT & repair — Diagnose panel faults quickly.
- Designers & photographers — Confirm a clean, uniform display.
- Gamers — Vet a new gaming monitor.
- Anyone — Rule out a screen defect.
Benefits
- Makes tiny pixel faults obvious.
- Works on any screen with a browser.
- No install — start testing in seconds.
- Free and private.
Tips
- Clean the screen first so dust and smudges aren't mistaken for dead pixels.
- Test in a dark room — faults and backlight bleed are far easier to see.
- Look closely at the black and white fields especially: dead pixels show on black, stuck ones on white.
- A stuck pixel (lit in one colour) can sometimes be revived by gently massaging the spot; a truly dead one usually can't.
- Do this as soon as you get a new device, while you can still return it.
Common mistakes to avoid
Mistaking dust for a dead pixel
Fix: Wipe the screen first — dust moves or wipes away, a pixel fault doesn't.
Testing in a bright room
Fix: Dim the lights; faults and backlight bleed hide under glare.
Only checking one colour
Fix: Step through them all — a pixel dead on black may look fine on white.
Waiting too long
Fix: Test right away so you're still inside the return or warranty window.
How it works
- 1
Start the test
Fill the screen with a solid colour.
- 2
Cycle colours
Tap or use arrow keys to change.
- 3
Inspect closely
Look for spots that don't match.
Frequently asked questions
A dead pixel stays black on every colour; a stuck pixel is always lit in one colour (red, green or blue). Stuck pixels can sometimes be revived; dead ones usually can't.
Go full-screen, clean your screen first, and step through each colour in a dark room. Any pixel that doesn't match the field is a fault — as long as it isn't just dust.
Yes — it's a quick way to inspect a new monitor, laptop or phone for panel defects before the return window closes.
A dead pixel stays black on every colour; a stuck pixel is always lit in one colour. Stuck pixels can sometimes be revived; dead ones usually can't.
Go full-screen, clean the screen, and step through each colour in a dark room. Any pixel that doesn't match the field is a fault — as long as it isn't dust.
Yes — it's a quick way to inspect a new monitor, laptop or phone before the return window closes.
Yes — free, no sign-up, runs in your browser.
Conclusion
Flood your screen with solid colours to expose dead pixels, stuck pixels and backlight issues in seconds. Clean the screen, dim the room, and step through every colour — and do it the day a new device arrives, while you can still act on what you find.