Check viewport configuration, responsive meta tags and common mobile usability signals.
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The Mobile-Friendly Checker is a free tool that inspects a web page for the signals that decide whether it works well on phones. Google uses mobile-first indexing, meaning it ranks the mobile version of your page, so a missing viewport tag or a fixed-width layout can directly hurt visibility. The tool reads the page's real, live HTML and reports the key mobile usability signals — no signup, no limits.
https://example.com).<head> and markup.width=device-width, initial-scale=1.user-scalable=no or tiny font sizes block readability.Run the tool on a homepage and you might see a pass for a correct viewport tag and HTTPS, but a warning that the layout sets a fixed 980px width and disables zoom with user-scalable=no — two changes that would immediately improve the mobile experience.
Yes — completely free, with no signup and no usage limits. Test as many URLs as you like.
No — it is the essential first step, but true responsiveness also depends on CSS and content width. The tool flags the markup-level signals that most often cause mobile problems.
Speed matters too, so pair this with the Page Speed & Size Test test and the On-Page SEO Audit for the full picture, and read our mobile-first indexing guide to prepare for how Google evaluates your site.
Guides, tips and tutorials hand-picked for this tool — go from running a check to actually fixing it.
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