Screen Size Checker
Instantly check screen resolution, viewport and device pixel ratio.
Free - Free to use — no signup or installation required.
About Screen Size Checker
A lightweight web tool that reports your browser-reported screen resolution (in CSS pixels), viewport size, and device pixel ratio (DPR). Explains the difference between CSS pixels and a display’s native pixels and helps you measure physical screen size in inches. Useful for web developers, designers and QA to verify responsive layouts, scaling and display metrics without installing software.
Key Features
- Reports browser-reported screen resolution in CSS pixels
- Displays viewport size and aspect ratio
- Shows device pixel ratio (DPR) and explains system scaling
- Guidance for measuring screen size in inches
- Explains CSS pixels vs native display pixels
Who is this for?
Web developers, UI/UX designers, QA testers and anyone who needs to check display/viewport metrics.
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FreeFree to use — no signup or installation required.
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