Use clipping, shadow-detail, contrast, and color patterns to inspect your HDR setup. Browser patterns cannot measure peak brightness in nits or verify HDR certification.
Inspect near-white clipping, shadow detail, contrast blocks, and color patches on your display. This browser pattern check cannot measure brightness in nits or verify HDR certification.
Near-white steps (200–255). Check if you can distinguish all steps.
This tool shows four browser-rendered patterns for visual inspection: near-white clipping, shadow detail (near-black steps), contrast blocks, and saturated color patches. If your monitor supports HDR, these patterns can help you notice obvious clipping or washed-out colors. They do not measure brightness in nits, verify local dimming, or replace HDR video, games, or a colorimeter. Enable HDR in your operating system before testing.
The patterns can reveal obvious clipping, crushed shadows, washed-out SDR mapping, and whether HDR mode appears active on the selected display.
A web page cannot read or verify actual peak brightness, local dimming behavior, EOTF tracking, or DisplayHDR certification.
Windows, macOS, browser color management, GPU drivers, and monitor firmware can all tone-map the same pattern differently.
Use native HDR video, games, monitor test files, or a colorimeter when you need a calibration-grade answer.
Entry-level. Limited local dimming. Visible HDR improvement is minimal on most content.
Mid-range. Noticeable HDR in highlights. Good for gaming and streaming.
Premium HDR. Strong highlight punch. Suitable for high-end gaming and media production.
Requires near-zero black levels. Best for cinema-quality contrast in dark rooms.
Common questions about HDR standards, enabling HDR, and display performance.
More free tools to check your setup.
Check your monitor for dead pixels, stuck pixels, and screen uniformity with a full-screen color test.
Calibrate monitor brightness and contrast with near-black, near-white, ANSI contrast, PLUGE, and white clipping patterns.
Check monitor color banding, posterization, gradient smoothness, and 8-bit vs 10-bit bit depth online.
Check your display color depth and view gradient test patterns to detect 8-bit vs 10-bit color banding.
Check monitor Hz, 60Hz, 144Hz, 240Hz, frame pacing, and display refresh rate online.
Guides on HDR monitors, calibration, and display technology.
If a refresh rate test reports 60Hz on a 144Hz or 240Hz monitor, check OS settings, cable limits, browser throttling, VRR, duplicated displays, and power mode.
A black dot on white is usually a dead pixel. A bright colored dot on black is usually a stuck pixel. Here is how to check before you try a fix or ask for a return.
If your monitor looks too blue, too bright, or just wrong, start with sRGB mode, lower brightness, 6500K, and built-in calibration tools before buying a colorimeter.
If you see a strange dot, patch, or shadow on your display, use white, black, gray, and color tests to figure out whether it is a dead pixel, a stuck pixel, IPS glow, backlight bleed, or burn-in.
A practical used-monitor checklist: check pixels, backlight bleed, refresh rate, ports, scratches, and return risk before you hand over money.
Choosing between TN, IPS, VA, and OLED monitor panels? IPS is the safest all-round pick, VA wins on contrast, OLED looks best, and TN mostly survives on price and speed.