Read browser reported resolution, viewport, pixel ratio, color depth and an estimated refresh rate without installing software.
Why this test is useful
Browser reported resolution and device pixel ratio describe the web rendering environment and do not always equal the panel native pixel count. For certified resolution, refresh rate or panel specifications, compare the browser result with the operating system and the manufacturer documentation.
Before you start
- Use the display native resolution when possible and keep browser zoom at 100 percent so fine patterns are not rescaled.
- For certified resolution, refresh rate or panel specifications, compare the browser result with the operating system and the manufacturer documentation.
A reliable way to run the test
- Browser reported resolution and device pixel ratio describe the web rendering environment and do not always equal the panel native pixel count.
- For certified resolution, refresh rate or panel specifications, compare the browser result with the operating system and the manufacturer documentation.
- When you notice a suspicious point or region, remember its exact position and repeat the same location with another pattern.
How to read the result
Browser reported resolution and device pixel ratio describe the web rendering environment and do not always equal the panel native pixel count. For certified resolution, refresh rate or panel specifications, compare the browser result with the operating system and the manufacturer documentation.
What to do next
- For certified resolution, refresh rate or panel specifications, compare the browser result with the operating system and the manufacturer documentation.
- After an artificial pattern reveals something, check the same area with real photos, video or games at your normal viewing distance.
What this test cannot prove
Browser timing and display information are practical estimates, not laboratory instruments or certified specifications. The test itself runs in the browser. Hosting, analytics or advertising can still make ordinary network requests if the site owner enables them.