Test any website’s responsiveness with a simple browser tool. Instantly preview sites at different screen sizes using a handy bookmarklet—no install needed.
Check website responsiveness instantly
Malte Wassermann's experiments site offers a handy browser-based tool called Viewport Resizer. With it, you can quickly test how any website looks and behaves on different screen sizes without installing extra software. Just save the bookmarklet, visit the site you want to test, and click—it's that easy.
This tool is perfect for web designers, developers, or anyone curious about how a website adapts to various devices. It's a simple way to make sure your site is mobile-friendly and looks great everywhere. Whether you're working on a new project or just checking your favorite pages, you'll find it fast and straightforward to use.
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