Test display brightness uniformity and backlight issues
This tool helps you detect brightness uniformity and backlight issues on your display. By showing different levels of gray, it's easier to spot uneven brightness distribution.
Adjust the slider to select the brightness level you want to test
Click the 'Enter Fullscreen Test' button
Observe if brightness is uniform across all areas of the screen
Use arrow keys or slider to switch between different brightness levels for comparison
Some areas of the screen are noticeably brighter or darker than others. This usually indicates a problem with the backlight system.
Visible light leaking from the edges or corners of the screen on dark backgrounds. This is more noticeable in dark environments.
Cloud-like bright patches appearing in the center or certain areas of the screen. Most visible at low brightness with dark backgrounds.
Quick browser-based visual diagnostics
Simple controls for repeatable screen checks
Helpful for troubleshooting monitors and displays
No installation required before testing
Use Brightness Test to test display brightness uniformity and backlight issues.
Use it when you want a fast visual check before calibration, troubleshooting, or buying a new display.
Open the test in a stable viewing environment and compare multiple patterns or levels for more reliable results.