Screen Resolution & Device Info
ReportFree screen resolution test online — your resolution, screen size in pixels and device pixel ratio, read straight from the browser.
Everything runs in your browser. Nothing is uploaded.How to use the Screen Resolution & Device Info online
- 01 Everything is detected instantly — no test or permission needed.
- 02 Display covers resolution, pixel ratio, color depth and touch.
- 03 System shows OS, browser, CPU cores and memory.
- 04 Graphics reports your GPU via WebGL (where the browser exposes it).
- 05 Use Copy results to paste the full report into a support ticket.
Common problems & fixes
- Resolution looks scaledWindows display scaling changes the reported CSS resolution. Device pixel ratio shows the true scale factor.
- GPU shows unavailableSome Safari versions hide the WebGL renderer string for privacy — try Chrome to see it.
- Memory unavailablenavigator.deviceMemory isn't implemented in all browsers; Chromium exposes it, Firefox doesn't.
Related checks
While you are here, you can also fill the screen to hunt defective pixels, measure panel refresh without installing software, or see charge state and time estimates.
Working through the whole category? Browse all system tests in one place.
Frequently asked questions
Open this screen resolution checker — the Display section shows the resolution your browser sees, with no install required.
The Display section reports the CSS pixel width × height this browser sees for the current viewport and display.
Here that means the pixel dimensions the browser reports (CSS pixels), not the physical diagonal in inches — device pixel ratio is listed so you can derive physical pixels on HiDPI panels.
OS scaling, browser zoom, and multi-monitor setups change what the page sees. Device pixel ratio shows the true scale factor.
Privacy modes and certain browsers (notably Firefox/Safari) withhold details like device memory or the GPU string. The report degrades gracefully.
How many physical pixels map to one CSS pixel. A Retina/HiDPI screen reports 2× or more.
No — it is read from your browser and shown only to you.