The BEST FREE Tool for Responsive Web Design Testing

Smartphone and tablet simulator on computer with several models to test mobile responsive websites.

Preview how websites & landing pages appear on mobile. Use our Page-oscope to compare two devices simultaneously or Sign Up to test on all devices at once!

Test your websites in smartphone & tablet emulators. Apple iPhone 5. HTC One. Nokia Lumia 920. Samsung Galaxy Y. Google Nexus 7. Apple iPad Mini. Test again.

PageSpeed Insights Docs Enter a valid URL Analyze Make your web pages fast on all devices Check out What's new Documentation Learn about Web Performance Optimize Cumulative Layout Shift · Optimize Largest Contentful... · Web Vitals

Our tool will evaluate your site's mobile-friendliness for key technical (page speed) and usability (viewport settings, text size, touch elements, and on- ...

Mobile Friendly Test is a tool that allows you to easily carry out a mobile site test telling about a website's score in terms of mobile responsiveness.

Mobile website testing focuses on ensuring your website functions and performs well on mobile devices, accounting for varying screen sizes, touch gestures, and ...

The Bing Mobile Friendliness Test Tool lets you see if a page is mobile-friendly and helps understand why with detailed explanations.

Check site on real mobile devices instantly. Just enter URL to test if site is compatible across 3000+ mobile devices & browsers. Try for Free.

Check your site's mobile version and ensure responsiveness. Use our tool for a mobile-friendly website. Test on various devices and screen sizes online.