HDR Test
Check HDR capability and inspect highlights, shadow detail, and smooth gradients.
HDR Test
SDR Reference
HDR Highlight
Wide-gamut preview
HDR Highlight Reference Levels
Reference levels only — this test does not measure peak brightness. 100 marks the SDR white reference.
Near-Black Detail Steps (0% to 15%)
HDR Luminance & Color Gradient
Preview · For HDR inspection, enable HDR in your system settings when supported, then enter fullscreen and inspect the reference patterns.
F Fullscreen
Test mode
Pattern Notes
- Highlights test reference levels (100 to 1000+).
- Shadow steps check near-black OLED/LCD black crush.
- Gradients check luminance transitions and color gradients.
Browser-Reported Capabilities
These are browser-reported capability indicators, not physical monitor measurements.
High means the browser reports a high dynamic-range capable output. Standard means the browser reports standard dynamic range.
What do you see?
Your result:
No selection yet — pick what you see above.
Guide
How to test HDR
01
Enable System HDR
Turn on HDR in your operating system display settings.
02
Go Fullscreen
Press F to expand the test patterns to full viewport size.
03
Inspect Patterns
Step through Highlight, Shadow, and Gradient test modes.
04
Check Observations
Mark what you see in the checklist to record your result.
Understanding HDR
About browser HDR testing
Browser-reported capabilities
The test queries browser media features such as (dynamic-range: high) and (color-gamut: p3/rec2020). These indicate whether your browser and output environment report support for HDR-capable visuals and wider color gamuts. They do not measure your monitor's physical capabilities.
Visual inspection focus
HDR inspection relies on your eyes to check whether bright highlights appear noticeably brighter without losing detail, dark shadow steps remain distinct, and gradients transition smoothly without heavy banding.
Important disclaimers
This test does not measure physical peak brightness in nits, contrast ratio, or actual color gamut coverage. It does not assign DisplayHDR tiers such as 400, 600, or 1000, or confirm specific HDR formats such as HDR10, HDR10+, Dolby Vision, or HLG. Browser capability detection describes software/output capability, not guaranteed monitor hardware performance. Visual results are subjective and can be affected by OS HDR settings, browser color management, display brightness, and ambient lighting.
What is HDR Test?
An HDR test checks browser-reported HDR and wide-gamut capabilities and displays reference highlight, shadow-step, and gradient patterns so you can visually inspect whether HDR content appears with bright highlights, visible shadow detail, and smooth transitions.
FAQ
HDR Test FAQ
01How do I test if my monitor supports HDR?
Enable HDR in your operating system if supported, then use the HDR capability and visual pattern checks to inspect the current environment.
02How do I know if HDR is working on my monitor?
Check the reported browser capability and inspect HDR highlight, shadow, and gradient patterns. The result is a browser-based indication, not a measurement of the panel.
03Can this HDR test measure peak brightness or nits?
No. The reference brightness patterns do not measure the display's actual brightness in nits.
04Can this test tell if my monitor is DisplayHDR 400, 600, or 1000?
No. Display certification levels require measurements that a browser cannot perform.
05Why does my HDR monitor show standard dynamic range?
HDR may be disabled in the operating system or the current browser/output path may not be reporting HDR capability.
06What should I look for in an HDR test?
Look for bright highlights that retain detail, visible shadow detail, and smooth gradients without obvious clipping or banding.
07Can this test tell if my monitor supports HDR10 or Dolby Vision?
No. Browser capability checks should not be treated as proof of support for a specific HDR format.