Device presets: iPhone SE, iPhone 14 Pro, iPad Air, MacBook 13", Desktop 1440px
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Preview a website on different devices via iframe
Responsive Viewport Tester lets you preview any site at popular device resolutions right in your browser. Choose a preset (iPhone SE, iPhone 14 Pro, iPad Air, MacBook, Desktop) or enter custom dimensions—the iframe will show the site at the selected size. Handy for quickly checking responsive layouts without emulators.
Device presets: iPhone SE, iPhone 14 Pro, iPad Air, MacBook 13", Desktop 1440px
Input field with custom width and height
Iframe preview right on the page
Warning for X-Frame-Options: SAMEORIGIN (explains why)
Switch between landscape and portrait orientation
Display of the current viewport dimensions
The tool creates an iframe with the specified width and height. The browser loads the specified URL inside the iframe, simulating a view in a window of the selected size. This is not a full device emulation (there are no touch events or user-agent switching), but it’s enough to visually check breakpoints and media queries.