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Mobile Friendly Test
Google deprecated the standalone Mobile-Friendly Test API in December 2023. This tool runs a lightweight static check: presence of viewport meta tag, viewport content correctness, responsive CSS media queries, and fixed-width element warnings. For full Lighthouse-based mobile audit (with rendering simulation), use our PageSpeed Test with strategy=mobile.
Google replaced the standalone Mobile-Friendly Test (December 2023) with Lighthouse-based mobile auditing in PageSpeed Insights. The new approach gives more detailed metrics (LCP, CLS, INP) instead of a binary mobile-friendly verdict. The standalone tool was deprecated but Lighthouse mobile audit (which we use in our PageSpeed Test) is the replacement.
Missing or incorrect viewport meta tag. Without , the page renders at desktop width on mobile and users have to pinch-zoom. Second most common: fixed-width elements that overflow on small screens (max-width: none on tables, very wide pre/code blocks).
Yes. Google has been mobile-first indexing since 2019 — the mobile version of your page is what Google indexes. Non-mobile-friendly pages can still rank but typically lose to mobile-optimised competitors for the same query. Core Web Vitals (which only run on mobile) are direct ranking signals.
Could be: (1) JS-rendered content that loads after this tool's static check, (2) responsive CSS in external stylesheets we can't fetch separately, (3) viewport meta tag set via JavaScript instead of HTML. For accurate render-based testing, use PageSpeed Test mobile strategy which simulates an actual mobile browser.
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