Screen Resolution Tester
Test your website's responsive design across different devices.
Quick Examples
Test layout on a text-heavy responsive site.
Check responsive behavior of a popular framework.
Test a modern utility-first CSS documentation site.
Note on X-Frame-Options
Some major websites (like Google, Facebook, Twitter) prevent themselves from being displayed in iframes for security reasons (X-Frame-Options policy).
If a site shows a blank white screen or "Refused to connect", it likely has this protection. Drag and drop a local HTML file or test with your own development sites!