Mobile Friendliness Checker

The Mobile Friendliness Checker audits your page HTML for critical mobile SEO factors including viewport meta tag configuration, touch target sizing, font size legibility, and responsive design element compliance. Since Google's switch to mobile-first indexing, the mobile version of your page is the primary version Google evaluates for rankings — meaning mobile issues do not just hurt your mobile traffic, they hurt your desktop rankings too. This tool catches the most common mobile SEO failures before they cost you positions. The viewport meta check verifies that your page includes a properly configured viewport tag, which is the most fundamental requirement for mobile rendering; without it, mobile browsers render your page at desktop width and force users to pinch-zoom, which Google interprets as a poor mobile experience. Touch target analysis measures whether your clickable elements (buttons, links, form fields) meet the recommended minimum size of 48 by 48 CSS pixels with adequate spacing between them — undersized targets cause mis-taps that frustrate users and increase bounce rates. The font size audit flags text rendered below 16 pixels, which is generally the minimum for comfortable reading on mobile screens without zooming. Responsive image checks verify that your images use srcset attributes or CSS-based responsive techniques rather than serving desktop-sized images to mobile devices, which wastes bandwidth and slows page load times dramatically on cellular connections. When reviewing results, prioritize viewport and font issues first because they have the most direct impact on Google's mobile usability assessment. Pro tip: test your page HTML through this tool using the actual source code from your live site rather than your development build, because build processes, CDNs, and server-side rendering can all modify the HTML in ways that introduce or resolve mobile issues you would otherwise miss.