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.
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.
Choose monitor test software by the problem: browser patterns for pixels and uniformity, system settings for display modes, and instruments for color measurement.
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.