Screen Resolution Test - Estimate Browser Viewport and Display Size
Run a screen resolution test to view browser viewport size, screen size, device pixel ratio, scaling clues and estimated display resolution.
Quick answer
A screen resolution test reports browser-readable screen size, viewport size, device pixel ratio and scaling clues for the current display.
Method: ScreenTestKit generates the test surface in your browser. Results depend on visual inspection; the site does not read or diagnose physical panel hardware.
How to use this test
- Open the page on the exact screen you want to check.
- Compare screen size, viewport size and device pixel ratio.
- Check browser zoom and operating system scaling if numbers seem unexpected.
- Use the PPI or aspect ratio calculators if you need physical display estimates.
What to watch for
- A viewport that is smaller than the screen because browser chrome, zoom or split-screen mode is active.
- High device pixel ratio values on phones, tablets and high-density laptops.
- External monitors that report differently through docks, scaling or browser windows.
- Differences between CSS pixels and physical hardware pixels.
How to interpret results
Viewport is smaller
That is normal when the browser is not fullscreen or when UI controls take space.
DPR above 1
The display uses more physical pixels per CSS pixel, common on retina and high-density screens.
Unexpected resolution
Check OS scaling, browser zoom, cable, dock and monitor input settings.
Frequently asked questions
Why does this differ from the box specification?
Browsers expose CSS and viewport values, which are affected by scaling, zoom and window size.
Can this identify my monitor model?
No. Browsers normally do not expose exact monitor model information for privacy reasons.