Backlight Bleed Test

A backlight bleed test uses a black full-screen background in a dim room so you can look for uneven glow near the edges and corners.

Custom HEX

rgb

Brightness: 100%

High brightness can feel harsh in a dark room. Lower brightness if your eyes feel strained.

Timer

Shortcuts: F fullscreen, Esc exit fullscreen where supported, Space controls, 1-9 preset colors, arrow keys cycle test colors. In dead pixel fullscreen, tap to advance and swipe left or right to change colors.

Used Monitor Test Checklist

Checklist coming soon.

Quick answer

A backlight bleed test uses a black full-screen background in a dim room so you can look for uneven glow near the edges and corners. Choose a color, open it full screen, adjust brightness if needed, and press Esc to exit where supported.

Summary

Best for	Checking edge glow on a dark screen.
Main control	Color presets, brightness, timer and fullscreen.
Exit	Press Esc where supported or use the on-screen exit button.

How to test

Dim the room, open the black screen in fullscreen, and let your eyes adjust. Look around the edges and corners for bright patches or uneven glow.

Some glow can be normal depending on the panel type, brightness and viewing angle.

Common mistakes

Do not test with room reflections on the screen. Do not judge from an extreme side angle unless that is how you normally use the monitor.

Lower brightness and test again if everything looks washed out.

Warranty note

If a new display has a clear issue, take photos at normal brightness and contact the seller or manufacturer. This is not legal advice.

Tool category

Browse more tools in Screen Tests.

White ScreenOpen a clean white screen for light, focus and cleaning.Black ScreenUse a black screen for low light, focus and display checks.Color ScreenPick any full-screen color with HEX or RGB controls.Dead Pixel TestCycle colors to inspect dead or stuck pixels.

What Is a White Screen Used For?Learn practical uses for a white screen, including light, video calls, cleaning, focus and monitor checks.How to Test a Monitor for Dead PixelsUse solid full-screen colors to check a monitor, phone or tablet for dead or stuck pixels.

FAQ

Is backlight bleed easier to see on black?

Yes. Bright patches stand out most on a dark screen.

Can this fix backlight bleed?

No. It only helps you inspect the display.