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Screen Resolution, Viewport Size & Pixel Ratio

Check your screen resolution, browser viewport, device pixel ratio, colour depth and GPU.

Your screen resolution is reported in CSS pixels, which is not always the number of physical pixels. Multiply by the device pixel ratio for the hardware figure — a 2560 × 1440 panel at 2× reports 1280 × 720 to CSS. This page shows both, plus the browser viewport, colour depth, GPU and display capabilities.

Runs in your browser
Privacy
Runs entirely in your browser — nothing is uploaded
Cost
Free, unlimited, no sign-up

Frequently asked questions

Why is my reported resolution smaller than my monitor?

Browsers report CSS pixels, and on a high-DPI display several device pixels make up one CSS pixel. A 4K screen at 200% scaling reports 1920 × 1080 with a pixel ratio of 2. Multiplying the two gives the physical panel resolution back.

What is the difference between screen size and viewport size?

Screen size is the whole display; the viewport is the area your page can actually draw in, after the browser chrome, scrollbars and any OS bars. Responsive breakpoints match the viewport, which is why it is the number worth designing against.

Why does the GPU name say "ANGLE" or show nothing at all?

On Windows, Chrome renders WebGL through ANGLE, which prefixes the real adapter name. Firefox and Safari increasingly mask the GPU string entirely as an anti-fingerprinting measure, so an empty value means privacy protection rather than a missing GPU.

How to use the what is my screen resolution?

  1. 1Turn "Include GPU and display capabilities" on or off as needed.
  2. 2The result appears immediately — copy or download it.

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Put the working what is my screen resolution? on your own site. It runs in your visitors' browsers exactly as it does here — free, no account, nothing uploaded.

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