Meet the Dead Pixel Test & Screen Checker
Test your monitor, laptop, phone or TV for dead pixels, stuck pixels, backlight bleed, banding, ghosting and gamma. 11 full-screen colours.
- Free to use
- No signup
- Nothing to install
- Runs in your browser
On the white screen you see one black dot → dead pixel. On the black screen one green dot stays lit → stuck (hot) pixel.Open the Dead Pixel Test & Screen Checker
Illustration. Open the tool for the real thing.
What is the Dead Pixel Test & Screen Checker?
A dead pixel is a tiny dot that never lights up; a stuck pixel is stuck on one colour. Both are easiest to see against a plain full-screen colour. This tool fills your screen with black, white, red, green, blue, yellow, cyan, magenta and grey one at a time so any faulty dot stands out, and it is the standard way to inspect a new or second-hand monitor, laptop, tablet, phone or TV.
Click to move to the next colour, use the arrow keys to go back and Esc to leave. Black reveals stuck bright pixels and backlight bleed at the edges; white, red, green and blue reveal dead pixels. Beyond solid colours there are 15 test patterns — 1-pixel checkerboard, colour bars, gradient ramps for banding, grey steps, near-black and near-white steps, a gamma check, geometry grid, sharpness and text, convergence lines, moiré stripes, a motion/ghosting test, backlight-bleed and burn-in checks — plus an auto-cycle mode, a stuck-pixel fixer you can drag over the faulty spot with a 5-minute to 1-hour timer, and a checklist that turns your findings into a copyable report for a warranty claim or return.
3 steps to your result
Open the tool and follow along. Nothing to install.
What you get
Black, white, primaries, secondaries and greys, manual or timed.
Banding, gamma, ghosting, convergence, sharpness, near-black and more.
Noise box with a timer you can place right over a stuck pixel.
Tick what you found and copy or download a report.
AZRS tools are free to open and use.
It opens in your browser, so there is nothing to download.
Used for
Pick one to see how it fits.
How it compares
A plain look at this tool next to the usual alternative.
| This utility | Desktop software | |
|---|---|---|
| Install | Nothing to install | Usually an app or program to install |
| Account | No signup | Depends on the product |
| Cost | Free to use | Free or paid, depends on the product |
| Where it runs | In your browser tab | On your computer |
Questions people ask
What is a dead pixel?
A pixel that stays black because it receives no power. It is permanent and cannot be repaired by software.
What is a stuck pixel?
A pixel stuck on one colour. It can sometimes be fixed by flashing colours or by gentle massage.
How many dead pixels are acceptable?
It depends on the manufacturer's policy and pixel class — many allow a few defects on large screens. Check your warranty.
What is backlight bleed?
Light leaking around the edges of an LCD, visible on a black screen in a dark room. A small amount is normal.
Is the pixel fixer safe?
It is safe for displays but flashing colours can trigger seizures in people with photosensitive epilepsy — do not use it if that applies to you.
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Try the Dead Pixel Test & Screen Checker now
11 full-screen colours, 15 test patterns, pixel fixer and an inspection report. Free to use.
Try it free