What Is My Screen Resolution? (Hz and Scaling)

This page shows the display information your browser reports. The screen resolution at the top is in CSS pixels, after the operating system's scaling, so it can differ from the panel's actual pixel count. A 1920×1080 monitor with Windows scaling at 125% reports 1536×864 with a devicePixelRatio of 1.25; multiplying the two gives the physical pixels shown alongside, 1920×1080 in this example.

Phones work the same way. An iPhone 15 reports 393×852 at a ratio of 3, which is 1179×2556 physical pixels. The ratio includes the browser's zoom as well as the system setting, so keep the browser at 100% for accurate figures; with fractional ratios the product can be off by a pixel or two.

Below that are the area the page actually uses inside the browser (the viewport), the space available without the taskbar, the whole browser window, the aspect ratio (16:9, 21:9 and so on) and the orientation. These are the numbers used to set responsive breakpoints, match a screen-share or recording resolution, or choose game and video settings. They update as soon as the window is resized or moved to another monitor.

The refresh rate is measured from how often the browser paints over about one and a half seconds, reported as the median. It normally equals the monitor's rate (60, 120, 144, 165 Hz and so on), but power-saving modes, battery saver and background tabs slow the browser down and some browsers cap it at 60 Hz, so check those settings first if it reads low. Variable-refresh screens (VRR, ProMotion) may read lower when nothing is moving. Colour depth, HDR and colour gamut (sRGB, Display P3, Rec. 2020) are the browser's view of the current connection rather than the panel's full capability, and with HDR switched off in the operating system a capable monitor still reads no. Nothing here is sent anywhere.