Design Tool

Responsive Design Tester

Preview any website at different viewport sizes. Test on phones, tablets, laptops, and desktops instantly.

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Some websites block iframe embedding via X-Frame-Options or CSP headers. If a site appears blank, it cannot be previewed here. Try sites like wikipedia.org, example.com, or your own projects.
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269 free tools. No signup. Open source. Built by Christian Bucher.

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