What's My Screen Resolution?
Your live screen resolution, viewport size, device pixel ratio, browser, and OS — read straight from your browser. No install, no tracking.
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FAQ
- What's the difference between screen resolution and viewport size?
- Screen resolution is the total pixel size of your entire display (for example 1920×1080). Viewport size is the pixel size of just the browser window's visible content area — that's what web pages actually render into. If your browser isn't maximised, they'll be different.
- What is device pixel ratio (DPR)?
- DPR tells you how many physical screen pixels make up one CSS pixel. A retina/HiDPI screen typically has a DPR of 2 or 3 — the browser reports a smaller 'CSS resolution' but each pixel is drawn using 4 or 9 physical pixels for sharper text and images.
- Why does my resolution look smaller than what the box said?
- The browser reports resolution in CSS pixels, and Windows / macOS scaling (like 125% or 150%) multiplies things up. Your true native resolution equals width × DPR by height × DPR. If your monitor is a 4K panel at 150% scaling, the browser will report 2560×1440 with a DPR of 1.5.
- Does this send any data to a server?
- No. Everything is read from your browser's own JavaScript APIs and displayed locally. Nothing is uploaded, logged, or stored.
- How do I test my resolution live?
- Just resize your browser window — the viewport values update in real time. Hit 'Refresh values' after rotating your phone or plugging in an external monitor to update all the numbers at once.