How to use this screen resolution
- 1
Review the live results dashboard.
- 2
Resize the browser to compare viewport and screen values.
- 3
Enter fullscreen for the largest browser-reported viewport.
- 4
Copy the diagnostics summary when asking for support.
Display
Screen Resolution Test
View the display and viewport values your browser reports, plus practical caveats around zoom, scaling, and multiple monitors.
No signup Browser-based Private by design
Current screen—
CSS pixels · DPR — · estimated —
Screen size—Browser-reported CSS size
Available screen—Excludes some system UI
Live viewport—Current page content area
Device pixel ratio—Device pixels per CSS pixel
Estimated device pixels—Derived; may not equal panel spec
Color / pixel depth—Browser-reported bit depth
Orientation—Current screen orientation
Platform—Coarse browser value
Browser—User-agent summary
Device class—Heuristic, not hardware identity
Touch support—Maximum simultaneous points
Dynamic range—Media-query hint only
Display mode—Tab, fullscreen, or installed
View browser user agent
—Why values can differ
Browser zoom and operating-system scaling affect CSS pixels. The estimated device-pixel dimensions multiply the reported CSS screen size by devicePixelRatio and are not a guaranteed physical panel measurement.
Understand the result
- CSS screen and available dimensions
- Viewport dimensions
- Device pixel ratio and estimated device pixels
- Color depth, orientation, platform, touch, and HDR media-query hint
Common problems
- Browser zoom and OS display scaling change CSS-pixel values.
- Multi-monitor systems usually report values for the current display.
- Estimated physical pixels are derived and may not equal the panel specification.
Privacy and browser limits
Most readings come directly from browser APIs and stay on your device. Operating systems, browser permissions, scaling, drivers, and hardware can affect what a page can observe.
For the cleanest result, use an up-to-date browser, keep the tab visible, and close apps that may already be using the device.
Questions about the screen resolution
Is my test data uploaded?
No. This test runs locally in your browser. RatedTechTools does not receive or store the device data shown by the tool.
Why is this different from the box specification?
The browser primarily reports CSS pixels. Operating-system scaling and browser zoom can make those differ from physical panel pixels.
Can a web page detect HDR perfectly?
No. A dynamic-range media query can provide a hint, but browser, operating-system, and display support vary.