How do I find a dead pixel on my screen?

Click "Start full-screen test" and step through black, white, red, green, blue and grey. A dead pixel is a dot that stays dark on the coloured and white screens. A stuck pixel is a dot that keeps showing one bright colour even on the black screen. Wipe the screen first, because dust and fingerprints can look like pixels, and scan each colour slowly from a normal viewing distance.

What is the difference between a dead and a stuck pixel?

A dead pixel never lights up, so it looks black on every colour. A stuck pixel stays on in one colour, red, green, blue or white, whatever the screen shows. Stuck pixels can sometimes be freed by flashing colours over them, but dead pixels are a hardware fault that software cannot repair. Under a manufacturer's warranty, the number of faulty pixels allowed varies, so check your warranty terms.

Does the stuck pixel fixer work, and is it safe to use?

It is not guaranteed to work. It flashes red, green, blue, white and black over a square that you place on the stuck pixel, at 3, 6 or 12 colour changes per second as you choose, and shows a running timer so you can leave it for about 10 minutes. The square can be 60 to 300 pixels wide and starts at 120. Because it flashes, it carries a photosensitivity warning, and "Start flashing" stays disabled until you tick the box that confirms you read it.

Who should not use the stuck pixel fixer?

Anyone with photosensitive epilepsy, a history of seizures triggered by flashing lights, or who is prone to migraines or headaches from flicker should not use it, and nobody nearby should be sensitive either. The flash is limited to a small square on a black screen and the default rate is the slowest, 3 changes per second, but that is not a guarantee of safety. Press Esc or "Exit" at any time to stop.

How do I change colour and exit the full-screen test?

Click or tap anywhere, or press Space, Enter, the right or down arrow or Page Down to go to the next colour. Press the left or up arrow or Page Up to go back. Press Esc or use the "Exit" button to leave. The on-screen controls hide after about 2.5 seconds so they do not cover a pixel; move the mouse or press a key to show them again. If the browser refuses full screen, such as on some phones, the colour covers the browser window and the tool says so.

Yes. Every tool is free to use, with no account and no credit card. The work runs on your device rather than on our servers, which is what keeps it free to run.

Does it work on mobile?

Yes. It runs in current mobile browsers on iOS and Android, with nothing to install.

🖥️

Free Dead Pixel Test

Check your screen for dead or stuck pixels with full-screen black, white, red, green, blue and grey, plus an optional stuck pixel fixer.

Runs in your browserNo sign-up, no pop-upsNo login requiredFree foreverFull-screen coloursStuck pixel fixerNo install

Fill the whole screen with one solid colour at a time and look for dots that stay the wrong colour. Pick the colour to start with, then step through the rest.

Start with

Clean the screen first so dust is not mistaken for a pixel. Look for a black dot on white, red, green and blue (dead pixel) and for a bright dot on black (stuck pixel). Sit at a normal distance and scan each colour slowly.

Stuck pixel fixer

A stuck pixel stays lit in one colour. Flashing colours quickly over it can sometimes free it. Drag the flashing square over the stuck pixel, or move it with the arrow keys, and leave it running.

Photosensitivity warning

The fixer flashes red, green, blue, white and black. Flashing lights can trigger seizures in people with photosensitive epilepsy and can cause discomfort or headaches. Do not use it if you or anyone nearby may be sensitive to flashing images. Choose the slowest rate if unsure, and look away if you feel unwell.

Flash rate

Square size: 120 px

I have read the warning and I am not sensitive to flashing images.

Run it for about 10 minutes, then check the screen again with the colour test. This is not guaranteed to work. A dead pixel, which stays black, cannot be repaired by software.

🖥️ Nothing is uploaded or stored. The colours are drawn by your browser on your own screen.

How It Works

The test paints your whole screen one solid colour at a time so a single misbehaving pixel stands out against it.

1
Choose a starting colour
Pick black, white, red, green, blue or grey, then click "Start full-screen test". The page asks your browser for full screen and covers the window if that is refused.
2
Step through the colours
Click, tap or use the arrow keys and Space to move between colours. Look for dark dots on bright colours and bright dots on black.
3
Try the stuck pixel fixer if needed
Read the photosensitivity warning, tick the box, choose a rate and square size, then start. Drag the flashing square over the stuck pixel and let it run for about 10 minutes.
4
Exit
Press Esc or click "Exit" to leave full screen and return to this page.

Nothing leaves your device. The colours are rendered by your browser and no data about your screen is sent anywhere.

Related Tools

📐

What Is My Screen Resolution

See your screen resolution in CSS and real pixels, window size, pixel ratio, colour depth, HDR, touch support and refresh rate, and copy it all.

Try it

👆

Touch Screen Test

Paint with your fingers to find dead zones on your touch screen, count how many touches it registers at once, and see pressure and contact size.

Try it

🖥️

Refresh Rate Test

Find out your screen's real refresh rate in Hz, see how many frames are dropped, and compare smoothness with a moving test pattern.

Try it

Free Dead Pixel Test

Stuck pixel fixer

How It Works

Related Tools

What Is My Screen Resolution

Touch Screen Test

Refresh Rate Test

Frequently Asked Questions