Web tools
Viewport Size Checker
See live layout and visual viewport dimensions in CSS pixels while resizing or zooming your browser.
Current readings
These readings stay in your browser. This tool does not save them, create an identifier or transmit a report.
Measure the space a page can use
Resize the browser window to update the layout viewport width and height. Those values include scrollbars. The document dimensions exclude them. The visual viewport is the visible region, which may shrink when pinch zoom or a mobile keyboard is active.
All widths and heights are CSS pixels, not hardware pixels. A page embedded in a frame measures that frame. Visual viewport values are shown only when the browser exposes them. Pause live updates to hold a snapshot, or refresh for a single reading. This page uses a mobile viewport declaration so narrow screens are measured at their normal CSS width.