Screen Resolution Checker
Find your screen resolution instantly. Shows display size, browser viewport, device pixel ratio and colour depth, with nothing at all to install.
- Screen resolutionThe whole display, in device pixels, as the operating system reports it.
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- Browser viewportThe page area only — smaller than the screen by the window chrome, and by any zoom.
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- Device pixel ratioDevice pixels per CSS pixel. Above 1 on every high-density display; also moves when you zoom.
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- Effective resolutionScreen size multiplied by the pixel ratio — the physical pixels actually being driven.
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- Colour depthBits used per pixel. 24 is standard: eight bits each for red, green and blue.
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- OrientationPortrait or landscape, where the browser exposes it. Desktop browsers often do not.
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Why the two numbers disagree
Your screen resolution is the whole display in device pixels. The browser viewport is only the part of the window a page can draw in, measured in CSS pixels — so it is smaller by the window chrome, and smaller again on a high-density display.
The device pixel ratio is the conversion between the two. A 3840-pixel-wide 4K monitor running at 200% scaling reports a 1920-pixel viewport: same panel, same pixels, described in the unit web pages are laid out in. Browser zoom moves the same number, which is why a page can report 1536 on a 1920 monitor — that is 1920 at 125% zoom, not a broken display.
Every value here comes from your browser, and browsers round and clamp some of them for privacy. Treat them as what web pages see, which is not always exactly what your hardware is doing.