HDR Test
Check if your display supports HDR (High Dynamic Range) and its color gamut. Test shadow and highlight detail.
Gradient Test
HDR detection relies on browser support. The gradients above should show smooth transitions with visible detail in both shadows and highlights on HDR displays.
How does this test work?
An HDR test checks your browser and display for HDR support and color gamut (sRGB, Display P3, Rec. 2020). It shows gradient tests to evaluate shadow and highlight detail.
How to use the HDR Test
Open the HDR Test on any device with a modern browser — desktop, laptop, tablet, or phone. No downloads, plugins, or signup required. The tool loads instantly and works in Chrome, Firefox, Safari, Edge, and other Chromium-based browsers.
Follow the on-screen instructions to run the test. Results are displayed immediately in your browser. You can repeat the test as many times as needed. For the most accurate results, close other tabs and applications to reduce interference.
Privacy: This test runs entirely in your browser using standard web APIs. No data is collected, uploaded, or stored on any server. Camera, microphone, keyboard, mouse, and controller inputs are processed locally and never leave your device. DeviceKit does not use analytics cookies or tracking scripts.
Browser note: Some hardware values are estimated because browsers limit direct access to device hardware for security and privacy reasons. Results may vary slightly between browsers and operating systems. For the most reliable measurements, use an up-to-date version of Chrome or Edge on a desktop computer.
Frequently Asked Questions
Why does the test say SDR only?+
Your browser or display may not support HDR, or HDR is not enabled in your OS display settings. Check Windows HDR settings or macOS display preferences.
Related Tests
Contrast Test
Test your display contrast with near-black and near-white steps. Check if your monitor clips shadow or highlight detail.
Gamma Test
Test your monitor gamma calibration with a grayscale step chart. Check if your display shows accurate brightness levels.
Screen Color Test
Cycle through solid colors to test your monitor, TV, or phone for dead pixels, stuck pixels, and color accuracy. Free fullscreen tool.