Monitor and screen tests
Free LCD and OLED screen tests for monitors, laptops, phones and TVs. Each one fills the screen with exact colors, with nothing to install.
Need test patterns for gradients, gamma, sharpness and uniformity? Open the monitor test.
All screen tests
Dead pixel test
Fill the screen with plain colors to spot dead or stuck pixels, and try to wake a stuck one.
Fills your screenBacklight bleed test
A full-screen black test with guidance to spot backlight bleed and IPS glow on LCD screens.
Fills your screenScreen burn-in test
Full-screen colors and grays that reveal image retention and burn-in on OLED, plasma and LCD screens.
Fills your screenMonitor test
Test patterns for your monitor: color, gradients and banding, sharpness, gamma and uniformity.
Fills your screen
Which test do I need?
For a new monitor, laptop or TV, run all four screen tests in this order. Each one checks a different fault, and none needs a download or a permission.
| Step | Check | Look for | Use |
|---|---|---|---|
| 1 | Dead and stuck pixels | Dots that do not match a plain color | Dead pixel test |
| 2 | Backlight bleed and IPS glow | Light leaking at the edges on black, in a dark room | Backlight bleed test |
| 3 | Uniformity, gradients and sharpness | Uneven gray, banding, blurry text | Monitor test |
| 4 | Burn-in (OLED, or a used screen) | Faint shapes of a taskbar or logo on gray | Screen burn-in test |
Testing a new monitor before the return window closes
Test a new screen on the day it arrives. A store return inside the return period is usually quicker than a warranty claim, and many faults count only under the maker's own rules, such as its pixel policy. Write down the date you bought it and the last day you can return it.
Let the screen warm up for a few minutes, wipe it with a dry cloth, and set it to its normal mode with eye care and night light off. Run the checklist above, copy each result from the tool, and take photos at normal exposure, without night mode. If you find a fault, contact the store with the results and photos before the return window closes. Keep the box until you are sure.
How the screen tests work
Full screen, plain colors
Each test fills your screen with exact colors or patterns, so faults stand out. Press Esc or tap Close to leave.
No permission needed
The screen tests only draw on your screen. They never ask for the camera or the microphone.
Nothing is uploaded
The screen size the tests show you is read on your device and never sent anywhere.