White Screen
Display a full white screen to find dead pixels, check screen brightness uniformity, and clean your display. Works on all devices.
How does this test work?
A white screen test fills your display with pure white to help you find dead pixels that appear as black dots, check brightness uniformity, and use as a light source for cleaning your screen.
How to use the White Screen
Open the White Screen 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 can a white screen test reveal?+
A full white screen makes dead pixels obvious as black dots. It also shows uneven brightness, yellow tinting, and helps you spot dust or smudges when cleaning your display.
Related Tests
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.
Black Screen
Display a full black screen to check for stuck pixels, backlight bleed, screen uniformity, and OLED burn-in. Works on monitors, TVs, phones, and tablets.
Screen Uniformity Test
Test your display for uniformity issues including clouding, dirty screen effect, tinting, and banding using gray and white test screens.
Red Screen
Display a full red screen to detect stuck sub-pixels and check color uniformity on monitors, TVs, and phones.