Screen Uniformity Test
Test your display for uniformity issues including clouding, dirty screen effect, tinting, and banding using gray and white test screens.
How does this test work?
A screen uniformity test shows gray and white backgrounds at different brightness levels to reveal clouding, dirty screen effect, vertical banding, and tinting on LCD and LED monitors and TVs.
How to use the Screen Uniformity Test
Open the Screen Uniformity Test on any device with a modern browser — desktop, laptop, tablet, or phone. No downloads, plugins, or signup required. The tool loads instantly and works in Chrome, Firefox, Safari, Edge, and other Chromium-based browsers.
Follow the on-screen instructions to run the test. Results are displayed immediately in your browser. You can repeat the test as many times as needed. For the most accurate results, close other tabs and applications to reduce interference.
Privacy: This test runs entirely in your browser using standard web APIs. No data is collected, uploaded, or stored on any server. Camera, microphone, keyboard, mouse, and controller inputs are processed locally and never leave your device. DeviceKit does not use analytics cookies or tracking scripts.
Browser note: Some hardware values are estimated because browsers limit direct access to device hardware for security and privacy reasons. Results may vary slightly between browsers and operating systems. For the most reliable measurements, use an up-to-date version of Chrome or Edge on a desktop computer.
Frequently Asked Questions
What is dirty screen effect?+
Dirty screen effect (DSE) is uneven brightness visible on solid-color backgrounds, especially gray. It looks like smudges or patches and is caused by manufacturing variations in the panel.
What gray levels should I test?+
Test at 5%, 10%, 20%, 50%, and 80% gray. Issues often appear most clearly between 5% and 20% gray.
Related Tests
Backlight Bleed Test
Use a fullscreen black screen to check your monitor, laptop, or TV for backlight bleed, edge glow, clouding, and screen uniformity issues.
Dead Pixel Test
Run a free dead pixel test in fullscreen. Check monitors, laptops, phones, tablets, and TVs for dead or stuck pixels using solid color screens.
Gradient Banding Test
Test your monitor, TV, or phone for gradient banding and color stepping artifacts using smooth color gradients.