Reads your browser's screen.width × screen.height, available area, and physical pixel estimate — all live as you resize.
Your screen resolution is
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Screen resolution is the number of pixels your display shows, written as width × height. More pixels mean more detail at the same physical size. Two displays with the same resolution can look very different in sharpness if their physical sizes differ — that difference is measured in PPI (pixels per inch).
Note that the value your browser reports is in CSS pixels. On phones and high-density laptop displays the physical panel has more pixels than this — the multiplier is your device pixel ratio. For a reference list of typical values, see common screen resolutions.
The total screen size describes the display. The available screen subtracts operating-system areas such as a taskbar or dock. That distinction matters for kiosks, multi-monitor setups and screenshots, but it is not the same thing as the CSS viewport.
Use screen resolution when documenting hardware, checking display settings or estimating screenshot size. Use viewport size for web layout bugs and DPR for high-density image questions.
You already did — the number above is your screen resolution, read directly from your browser. On Windows you can also find it under Settings → System → Display; on macOS under System Settings → Displays.
It means your display is 1920 pixels wide and 1080 pixels tall — about 2.07 million pixels in total. This resolution is also called Full HD or 1080p and has a 16:9 aspect ratio.
Your operating system applies scaling on high-density displays. Browsers report the scaled (CSS) resolution. Multiply by your device pixel ratio to estimate the native panel resolution — both values are shown above.
Indirectly. Websites respond to the browser viewport, not the screen. A 4K monitor with a half-size browser window renders the same layout as a smaller screen. See the viewport size checker for the value that actually drives responsive design.