Viewport Information — Live Window & Device Pixel Ratio
Check the current viewport dimensions of your browser in real time: inner, outer, and document-client sizes, available screen area, device pixel ratio, and scrollbar dimensions. Values refresh instantly as you resize or rotate your device — perfect for testing responsive breakpoints and media queries.
The tool also reports whether the page declares a viewport meta tag, which controls how mobile browsers render the layout.
Viewport Information FAQ
Does this work on all browsers?
Our mobile testing tools work best on modern browsers (Chrome, Firefox, Safari, Edge). Some features may not be available on older browsers that lack Web API support.
Is my device data collected?
No. All device information is read locally from your browser APIs. No data is transmitted to our servers or stored anywhere.
Is it free to use?
Yes. This tool is completely free with no usage limits, sign-up requirements, or hidden fees.