Free fullscreen monitor test patterns in one place: solid colors for dead and stuck pixels, black screens for backlight bleed, gray screens for uniformity, gradients for banding, and black and white level steps for brightness and contrast. Step through them or let them cycle.
How to run the monitor test
- Let the monitor warm up for a few minutes and clean the screen.
- Press F for fullscreen.
- Step through the tests with the arrow keys or Space, or jump to one with the buttons in the bar.
- Each test has a short tip in the bar telling you what to look for.
The tests
- Colors
- Black, white, red, green, blue, cyan, magenta and yellow for dead and stuck pixels.
- Backlight
- Black and near black for bleed, IPS glow and clouding.
- Uniformity
- 50% and 25% gray. The whole screen should look one even shade.
- Gradients
- Smooth ramps from black. Visible stripes mean banding.
- Contrast
- Black level squares from 1 to 16, and white level squares from 239 to 254. You should be able to tell most of them apart.
Adjusting your monitor
If the darkest black level squares all look black, raise the brightness or pick a different picture mode; if the brightest white squares blend together, lower the contrast. Banding on gradients can come from the panel, the cable or a low color depth setting in your graphics settings.
Questions
Do I need to download anything?
No. The test runs in your browser on any monitor, laptop, TV or phone.
Is this a calibration?
No. It helps you spot problems and adjust brightness and contrast by eye. Accurate color calibration needs a hardware colorimeter.
How do I go fullscreen?
Press F on a keyboard, or use the fullscreen button in the bar at the bottom. Press Esc or F again to leave. On iPhone, Safari does not allow real fullscreen, so add the page to your home screen for the cleanest view.