Screen Uniformity Test
Test how evenly your display lights up using solid color and gray fields. Dark grays and black expose backlight bleed and IPS glow, mid-gray shows the dirty-screen effect, and full colors reveal tint shifts from one corner to another. It's best run in a dark room, where faint problems become obvious.
What you can use it for
- Find backlight bleed and IPS glow in a darkened room
- Spot the dirty-screen effect on mid-gray fields
- Compare center-to-edge brightness on a new panel
- Check for warm or cool tint shifts across the display
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
Which fields show uniformity problems best?+
Black and dark gray reveal backlight bleed and clouding, mid-gray shows the dirty-screen effect, and full-screen colors expose tint shifts.
Should I dim the lights?+
Yes. Backlight bleed and clouding are far easier to judge in a dark room with the screen at a moderate brightness.
More screen tests
Dead Pixel Test
Cycle full-screen colors to find dead and stuck pixels fast.
Ghosting Test
A fast-moving object to spot motion blur and ghosting trails.
Backlight Bleed Test
Pure black screen with corner markers to spot edge light leak.
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.