Your screen size, viewport, pixel ratio and color depth as reported by this browser. Values refresh when you resize the window or rotate the device.
Click a color to fill the screen. Click anywhere to exit. Check for dead or stuck pixels.
| Device | Resolution | Aspect Ratio | Category | Match |
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Web designers testing a layout, support staff asking "what screen are you on?", and anyone buying a monitor or setting up a projector often need the numbers a browser actually sees. This page reads them the moment it loads: screen resolution, viewport, device pixel ratio (DPR), color and pixel depth, aspect ratio, inner and outer window size, orientation, touch support, a browser/OS guess and the screen area available to windows. It also has a solid-color dead pixel test and a table of typical sizes that highlights a row if it matches yours.
Browsers report sizes in CSS pixels, not the hardware pixels printed on the box. The two differ by the device pixel ratio: on a high-density laptop panel with a DPR of 2, the Screen Resolution card may show 1440 × 900 while the panel has 2880 × 1800 physical pixels. So a quick estimate of the physical resolution is screen width × DPR by screen height × DPR, taken at 100% browser zoom, because zooming in or out and operating-system display scaling both change the DPR the browser reports.
screen.width/height and screen.availWidth/availHeight (the latter minus taskbars or the dock).document.documentElement.clientWidth/Height, which excludes scrollbars. Window Inner Size (innerWidth/innerHeight) includes them; Window Outer Size adds the browser's toolbars and frame.window.devicePixelRatio, labelled standard below 1.5, Retina/HiDPI from 1.5 and 3x HiDPI from 3.Nothing is sent anywhere: all values are read and shown in your browser, and the page stores nothing.
Because of scaling. With display scaling at 150% or 200%, or on a Retina-class screen, the browser reports a smaller CSS size and a DPR above 1. Multiply by the DPR at 100% zoom to estimate the physical figure.
No. The table is a short list of example sizes as browsers typically report them, and device labels are only illustrations. Phones come in many sizes, and settings such as display zoom change what the browser reports, so an exact match is not expected.
No, it only helps you spot them. A pixel stuck on one color may sometimes recover, but a dead (always black) pixel is a hardware fault; check your manufacturer's warranty terms for how many defective pixels they accept.
Only where the browser supports the Screen Orientation API. Desktop screens usually report 0°, and a few browsers expose no angle at all.