The Mobile-Friendly Test is a free tool that checks whether your website displays correctly and is easy to use on smartphones and tablet devices. Since Google switched to mobile-first indexing in 2019, your mobile site's quality directly determines how Google ranks your pages — even in desktop search results.

This test simulates how a mobile browser renders your page and checks for common mobile usability issues that affect both user experience and rankings.

How to Test Mobile-Friendliness

• Enter your website URL
• Click Test — the tool renders your page in a mobile viewport
• View the mobile screenshot and a list of any issues detected

Common Mobile Issues Detected

• Text too small to read — font size below 16px on mobile
• Clickable elements too close together — tap targets under 48x48px
• Content wider than screen — requires horizontal scrolling
• Viewport not configured — missing tag
• Flash usage — not supported on iOS

How to Fix Mobile Issues

• Implement a responsive design with CSS media queries
• Add the viewport meta tag:
• Increase font sizes and tap target areas
• Test with our Screen Resolution Simulator for additional insight

A mobile-friendly site is no longer optional — it is a ranking requirement. Free, instant, no login needed.

Want to learn more? Read our complete guide: How to Speed Up Your Website and Improve Core Web Vitals →