WAVESPEED AI SCREEN TEST Nothing leaves your device

100% FREE

Dead Pixel & Screen TestFull-screen colours and test patterns.

Fill your screen with solid colours to find dead or stuck pixels and light bleeding from the edges, then check gradients, gamma, black level, text sharpness and motion blur.
The page also shows your real resolution, pixel ratio, colour depth and refresh rate.

Dead and stuck pixelsGamma, banding, motionStuck pixel fixer

No sign-up No upload No install

Screen resolution—

Pixel ratio—

Refresh rate—

Colour depth—

Orientation—

Measured from the browser’s frame timing. Keep the window still while it measures; a busy computer or battery saving can lower it.

Dead and stuck pixels, backlight bleed

Each colour opens full screen. Look closely for dots that stay black, white or one colour, and on black for light leaking at the edges. Click or press → for the next colour.

Test patterns

Stuck pixel fixer

Photosensitivity warning: this flashes rapidly changing colours. Don’t use it if you or anyone watching has photosensitive epilepsy, and look away while it runs.

A stuck pixel (one that stays red, green, blue or white) can sometimes be freed by flashing colours over it for a while. Click on the stuck pixel to put the flashing square over it, or leave it full screen. It can’t repair a dead (always black) pixel.

I understand the warningRun for

In a test: click or →/Space for next, ←/right-click for previous, H to hide the help bar, Esc to exit.

Runs in your browser. Nothing is recorded, stored or uploaded unless you download it yourself.

THREE SIMPLE STEPS

How to test your screen for dead pixels

Clean the screen

Wipe off dust first: a speck can look just like a stuck pixel. Then set the brightness to your usual level.

Open a colour full screen

Click a colour. It fills the screen; click or press → to step through black, white, red, green, blue and more.

Look closely

Scan the screen section by section. Note any dot that doesn’t match, then try the patterns for gradients, gamma and motion.

How to use the screen test

How to read the results

Dead or stuck pixel

A dead pixel stays black on every colour, most visible on white. A stuck pixel stays red, green, blue or white, most visible on black. Stuck pixels can sometimes be freed with the fixer; dead ones can’t.

Backlight bleed and clouding

On black in a dark room, light leaking from the edges or corners is backlight bleed; uneven patches across the middle are clouding. Some bleed is normal on LCD screens; check what your warranty allows.

Gamma, levels and motion

On the gamma pattern the square that blends into its stripes is your gamma (2.2 is standard). On the level patterns you should see almost every square. In the motion test a sharp moving box is good; a trail means slow response.

WaveSpeed AI

Something worth looking at

Your screen checks out? Fill it with your own AI pictures and clips made with WaveSpeed AI.

Start creating Explore 1,000+ AI Models

1,000+ AI models
Image, video and 3D
Pay as you go

$1 in free credits for eligible new accounts. No card needed. Generators have separate account and credit requirements. The screen test is free.

Screen test FAQ

How do I check my monitor for dead pixels?

Clean the screen, click Black, then step through the colours with a click or the → key. Look closely at each part of the screen. A pixel that stays black on bright colours is dead; one that stays lit in a single colour on black is stuck.

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

A dead pixel gets no power and stays black. A stuck pixel has one or more of its red, green or blue parts permanently on, so it shows as a coloured or white dot. Stuck pixels can sometimes recover; dead pixels can’t be fixed by software.

Can the stuck pixel fixer really fix a pixel?

Sometimes. Rapidly changing colours over a stuck pixel for several minutes can free it, especially if it’s new. It doesn’t work on dead pixels and may need several runs. Read the photosensitivity warning first and don’t watch the flashing.

How do I test for backlight bleed?

Darken the room, set brightness to your usual level, and open the black test. Light glowing along the edges or from the corners is backlight bleed. Take a photo with your phone at normal exposure if you need to show it to a seller.

Is the refresh rate shown correct?

It is measured from how often the browser draws a frame, which normally matches your display’s refresh rate. A busy computer, power saving, or a browser that limits frame rate can show a lower number. If it shows 60 Hz on a faster monitor, check the refresh rate in your system display settings.

Why is the resolution different from my monitor’s specification?

Systems scale the desktop on high-density screens. The page multiplies the scaled size by the pixel ratio to show the real number of pixels, which can differ slightly from the panel’s native resolution if scaling is set to a non-standard value.

Does the screen test work on phones and tablets?

Yes. On phones that don’t allow full screen for web pages, the test fills the whole window; hide the browser bars by scrolling or adding the page to your home screen for the best view.

Does the page record my screen?

No. It only draws colours and patterns; nothing is captured, stored or uploaded.

All Free Tools