Backlight Bleed Test
A fullscreen pure-black test built for new monitor owners searching for backlight bleed and IPS glow. Faint corner and edge markers show exactly where light leaks from, so you can judge bleed in a dark room right after unboxing. Not the same as a generic black screen — this page is named and designed for post-purchase panel inspection.
What you can use it for
- Inspect a new Acer, BenQ, LG, or Samsung monitor in a dark room
- Document backlight bleed for a warranty return
- Compare IPS glow vs backlight bleed on IPS panels
- Check if bleed is bad enough to exchange the panel
How it works
- 1. Customize. Open the Customize panel to set text, colors, theme, and animation speed to your liking.
- 2. Go fullscreen. Click Fullscreen for an immersive, distraction-free display on any screen.
- 3. Done. No login, no install, nothing to download — it runs instantly in your browser and your settings are remembered.
Frequently asked questions
How is this different from a black screen?+
It is a pure black field plus faint corner and edge markers so you can see how far light leaks extend from each edge — purpose-built for bleed inspection, not general use.
What is IPS glow vs backlight bleed?+
Backlight bleed is light leaking from the edges on dark content. IPS glow is a faint glow visible when viewing dark scenes at an angle on IPS panels — both show up on this test in a dim room.
More screen tests
Dead Pixel Test
Cycle full-screen colors to find dead and stuck pixels fast.
Screen Uniformity Test
Check brightness and color evenness across the whole panel.
Ghosting Test
A fast-moving object to spot motion blur and ghosting trails.
Color Banding Test
Smooth gradients to reveal color banding and bit-depth limits.
Contrast Test
Shaded squares to calibrate black levels and white clipping.
Resolution Test
Live readout of resolution, viewport, DPI scaling, and aspect ratio.
Text Sharpness Test
Tiny text samples to judge subpixel rendering and clarity.
Overscan Test
A 1-pixel grid and corner circles to fix overscan and cropping.