Black Level Test
Check black depth and shadow detail near black.
View the screen in normal viewing conditions. Look for black that appears noticeably gray or uneven.
What do you see?
This is a visual check, not a black-luminance measurement.
Keys: ← / → switch · F full screen · Esc exit
Guide
How to test
01
Darken the room
Lower ambient light so near-black differences are easier to see.
02
Go Fullscreen
Press Start or F so the pattern fills the whole display.
03
Check Pure Black
Look at the screen for black that appears gray, raised, or uneven.
04
Inspect Near-Black Steps
Note the darkest steps that stay distinguishable from black.
05
Record Observations
Pick the result that best matches each mode.
About
About this test
Visual inspection only
Black-level testing is a visual inspection of black and near-black reproduction. Your browser cannot measure the display's physical black luminance.
What can affect what you see
Ambient light, display brightness, viewing angle, OS/GPU settings, and panel characteristics can affect how black and shadow detail appear.
How it differs
Black Level
Black depth and very-low-level shadow visibility.
Backlight Bleed
Light leakage around edges or corners on dark screens.
Greyscale & Uniformity
Shade discrimination across the full range and spatial evenness.
What is Black Level Test?
A Black Level Test displays pure black and near-black patterns so you can visually inspect black depth and shadow detail. It is a visual check only — it does not measure luminance, contrast, or panel performance.
FAQ
Black Level Test FAQ
01How do I test the black level of my monitor?
Use the pure-black and near-black patterns and check how dark the screen appears and whether very dark shades remain visible.
02What should black look like on a monitor?
Black should appear as dark as the display and viewing conditions allow, without unnecessary gray or uneven areas.
03What is black crush?
Black crush happens when very dark shades merge into black, causing shadow detail to disappear.
04Why does black look gray on my monitor?
Ambient light, viewing angle, display settings, panel characteristics, and the display chain can all affect how black appears.
05What is the difference between black level and contrast?
Black level focuses on how dark black and near-black shades appear. Contrast looks more broadly at the separation between dark and bright levels.
06Can an online test measure my monitor's exact black level?
No. A browser test can help you visually inspect black and near-black reproduction, but it cannot measure physical luminance.