Black Level Test Online for Monitors, Laptops and TVs
Inspect near-black steps to check shadow detail, crush and panel uniformity. Use this free fullscreen display test on an LCD, OLED, laptop, phone or TV. It runs locally in your browser with no download or account.
How to use this Black Level Test and understand the result
Dim nearby lights and adjust brightness only enough to see the first near-black steps. In a dim room, separate the first few dark steps without raising brightness enough to wash out black.
What this online Black Level Test can reveal
If the first steps merge, black crush may be hiding shadow detail; if the whole field lifts, black level may be raised.
Limits of this browser test
Room light and panel gamma strongly affect near-black perception. Repeat any suspicious result on another input or browser before requesting a return, warranty inspection or calibration.
Display diagnostics
Focused checks for panel uniformity, motion, color and HDR-era display behavior.