Brightness Test
Test your monitor's brightness range and uniformity. Use the slider to step through different brightness levels and check for banding or uneven lighting.
Brightness Level
50%What is Monitor Brightness?
Monitor brightness (or luminance) refers to the intensity of light emitted from your screen, measured in nits (cd/m²). A typical office monitor outputs between 250-350 nits, while HDR monitors can reach 1000 nits or more. This test helps you visually evaluate how well your display reproduces different brightness levels from pure black (0%) to pure white (100%). Regular diagnostic verification ensures that your hardware operates at peak factory specifications and delivers reliable performance across gaming and professional tasks.
Why Test Brightness?
Testing brightness levels is essential for content creators, gamers, and anyone who cares about image quality. Uneven brightness across your screen can indicate backlight issues. If you cannot distinguish between adjacent low brightness levels (e.g., 5% vs 10%), your monitor may have poor shadow detail — meaning dark scenes in movies and games will look like a black blob instead of showing subtle detail. Utilizing standardized browser benchmarks eliminates the guesswork from troubleshooting, giving you real-time data to optimize your setup without third-party software.
How to Calibrate Brightness
For general use, set your monitor brightness so that the 5% patch is barely visible against the 0% (black) background. If 5% is invisible, your brightness is too low or your contrast is too high. If it is too obvious, your brightness may be set too high. For HDR content, refer to your monitor's specific HDR calibration guide. Whether you are fine-tuning hardware parameters, calibrating settings, or inspecting for defects, our tools run with sub-millisecond precision directly on your device.
Frequently Asked Questions
Everything you need to know about this tool and benchmarks