Black Level Test
Measure your display's black depth and shadow detail. Test patterns reveal whether your monitor crushes blacks or reveals the full shadow detail content creators intended.
Why use this contrast tool
Black level reference steps
Steps from 0 to 16 (in 8-bit) reveal whether your display crushes shadow detail or preserves it.
Pure black fullscreen
Display #000000 fullscreen to spot backlight bleed, IPS glow, and panel mura that lift blacks.
Near-black greyscale ramp
Ramp from 0 to 32 shows how smoothly your display transitions from black to dark grey.
Brightness adjustment guide
Step-by-step instructions to set brightness correctly for your ambient light without crushing shadows.
What is contrast
Black level is the darkest black your display can produce. On an OLED, that's true zero — pixels turn off entirely. On an LCD, it's the light leakage through the liquid crystals and backlight, which is always slightly above zero. Lower black level means deeper blacks, higher contrast, and more perceived image depth.
Black level interacts with brightness. Higher brightness raises the black floor proportionally on LCDs, lowering contrast. Lower brightness deepens blacks but may crush shadow detail. The right balance depends on ambient light — in a bright room, you need higher brightness and accept higher black level; in a dark room, lower brightness reveals deep blacks.
Black crush is the loss of shadow detail when near-black levels all render as pure black. Steps 1-16 in the reference ramp should be distinguishable from pure black; if they merge into one black blob, your display is crushing. This is common on VA panels with aggressive gamma and on cheap IPS panels with high black floor.
How to test
Step 1: Display the black level reference
Open the test above. A ramp of steps from 0 (pure black) to 16 (dark grey) appears.
Step 2: Count visible steps
How many steps can you distinguish from pure black? 4-5 is good; 8+ is excellent; 0-2 means black crush.
Step 3: Test pure black fullscreen
Display #000000 fullscreen. Look for any glow, patches, or unevenness — that's backlight bleed or IPS glow.
Step 4: Adjust brightness
Lower brightness until shadow detail just begins to crush, then back off one notch. This is your optimal brightness.
Step 5: Re-test after warm-up
Panels warm up over 30 minutes and black level may shift. Re-test for accurate results.
Common causes of contrast issues
Panel type limits
IPS black level ~0.1 nits, VA ~0.05 nits, OLED 0 nits. LCDs cannot match OLED blacks due to backlight leakage.
Backlight bleed
Light leaking through the bezel raises black level, especially in corners. See our <Link href="/backlight-bleed-test" className="prose-link">backlight bleed test</Link>.
Brightness too high
Higher brightness raises black floor proportionally on LCDs. Lower for deeper blacks.
Gamma too high
Gamma 2.4+ crushes near-black levels into pure black. Use gamma 2.2 for bright rooms, 2.4 only for dark rooms.
Frequently asked questions
Testing tips
- Test in a dark room — ambient light masks black level differences between panels.
- Aim for 4-5 visible steps above pure black in the reference ramp.
- Lower brightness until shadows crush, then back off one notch for optimal black level.
- VA and OLED have the deepest blacks; IPS is brightest but has the highest black floor.
Related tools
Black Level Testing: Why Your Monitor's Darkest Dark Matters
When was the last time you thought about your monitor's black level? Probably never — most users obsess over resolution, refresh rate, and color accuracy but ignore the darkest dark their display can produce. Yet black level is one of the most important specs for perceived image quality, especially for movies, games, and HDR content. A display with poor black level looks flat and washed out, no matter how bright it gets.
Black level is the darkest black your display can produce, measured in nits (candela per square meter). OLED achieves 0 nits — true black, because each pixel emits its own light and turns fully off. IPS LCDs typically hit 0.1 nits, VA LCDs around 0.05 nits, and cheap edge-lit LCDs 0.3 nits or higher. Lower is always better: deeper blacks mean higher contrast, more perceived depth, and more cinematic image quality.
Panel type is the biggest factor. OLED is the gold standard — pixels turn off for black, giving infinite contrast. VA is next, with deeper blacks than IPS thanks to vertically aligned crystals that block more light. IPS has the highest black floor because its crystals leak light even in the closed state, but it makes up for this with better viewing angles and color accuracy. TN panels are worst of all, with poor black level and poor viewing angles.
Test your display with our black level test. Display the reference ramp from 0 to 16 (in 8-bit values). Count how many steps you can distinguish from pure black — 4-5 is good, 8+ is excellent, 0-2 means your display is crushing shadow detail. Then display pure black fullscreen and look for any glow or patches, which indicate backlight bleed (light leaking through the bezel) or IPS glow (a property of the polarizer layer).
Black level isn't just a panel property — it depends on your settings. Brightness directly raises the black floor on LCDs: doubling brightness doubles black level. Lower brightness for deeper blacks, but watch for black crush — when near-black levels all merge into pure black, hiding shadow detail. Use the gamma 2.2 setting for bright rooms and 2.4 only for dark rooms; too-high gamma crushes shadows. Local dimming on mini-LED displays dramatically improves black level by dimming LEDs behind dark areas, at the cost of blooming around bright objects.
For dark-room movie watching or HDR gaming, OLED is unmatched — its 0-nit black level delivers true cinematic contrast. For a bright office, IPS is fine; the higher black floor is invisible in ambient light. Pair the black level test with our contrast test and backlight bleed test for a complete dark-performance audit. Your display's darkest dark matters more than you think.
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