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.
How does this test work?
A backlight bleed test displays a pure black screen in fullscreen so you can check for light leaking from the edges or corners of LCD monitors and TVs. Test in a dark room at moderate brightness for accurate results. OLED screens do not have backlight bleed.
How to use the Backlight Bleed Test
Open the Backlight Bleed 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 backlight bleed?+
Backlight bleed occurs when light from the LED backlight leaks through the edges or corners of an LCD panel, creating bright spots visible on dark scenes.
Is backlight bleed the same as IPS glow?+
No. Backlight bleed is light leaking from panel edges due to manufacturing. IPS glow is a warm glow visible at wide viewing angles and is a normal characteristic of IPS panels. IPS glow changes as you shift your viewing angle; backlight bleed does not.
Do OLED screens have backlight bleed?+
No. OLED pixels produce their own light individually, so there is no backlight to bleed. This test is designed for LCD, LED, and IPS monitors and TVs.
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.