SEOMaster
Mobile-friendly test — check your site on a phone
This free mobile-friendly test checks the signals that decide whether Google and your visitors consider a site usable on a phone: the viewport tag, whether zooming is blocked, responsive CSS, and page weight and speed over a mobile connection. No login, and it works for any site — including one you do not own.
What the mobile-friendly test covers
The viewport tag — Whether the page declares width=device-width. Without it a phone renders the page at desktop width and scales it down — text becomes unreadable and Google treats the page as not mobile-ready.
Pinch-to-zoom — Whether you block zooming with user-scalable=no or maximum-scale=1. Blocking zoom is an accessibility barrier for people with low vision and a genuine defect, not a matter of taste.
Responsive CSS — How many media queries actually appear in the page's stylesheets. A layout built on fixed pixel widths breaks on narrow screens no matter how correct the viewport tag is.
Weight and speed — Total page size with assets, request count, compression and server response time. On a mobile connection these decide whether a visitor sees your content before returning to the results page.
We do not check touch-target sizes or font legibility — the scanner does not measure those signals, so we do not claim them. The full list of what we measure and how is in the methodology.
Google retired its own mobile-friendly test
On 1 December 2023 Google withdrew the Mobile-Friendly Test along with its API, reasoning that mobile readiness had become a baseline rather than a differentiator — indexing is mobile-first, so the mobile version is the primary one. The difficulty is that people still need a quick answer to "is my site all right on a phone", and the surviving URL Inspection report in Search Console requires a login and verified ownership of the domain.
This test fills that gap: no login, any domain, and specific signals instead of a single pass/fail verdict.
The three things that break mobile most often
1. No viewport tag Without it a mobile browser assumes a desktop width (usually 980 px) and shrinks the whole page. The fix is one line in <head>:
<meta name="viewport" content="width=device-width, initial-scale=1" />2. Zoom blocked The attributes user-scalable=no and maximum-scale=1 take away a visitor's ability to magnify content. Remove them — there is no situation in which blocking zoom is the right answer.
3. Fixed widths instead of media queries A container at width: 1200px will break the layout on a phone regardless of a correct viewport tag. Use max-width and relative units:
.container { max-width: 1200px; width: 100%; padding-inline: 1rem; }Frequently asked questions
What does a mobile-friendly test actually check? It checks the technical signals that affect how a site behaves on a phone: viewport configuration, whether zooming is permitted, responsive CSS, asset weight and response speed. The result does not replace hands-on testing on real devices, but it identifies the most common faults quickly.
Does Google still have a mobile-friendly test? No. Google retired the Mobile-Friendly Test and its API on 1 December 2023. The URL Inspection report in Search Console partially replaces it, but it requires a login and verified domain ownership — so you cannot check somebody else's site with it, or your own quickly without setup.
Does responsiveness affect Google rankings? Yes, both indirectly and directly. Google indexes mobile-first, so it evaluates the mobile version as the primary one. If content is unavailable or unreadable on a phone, that affects indexing of the whole site, and mobile speed is additionally one of the Core Web Vitals signals.
What breaks the mobile version most often? Three things: a missing viewport tag (the page renders at desktop width and the visitor has to zoom out), blocked zooming via user-scalable=no or maximum-scale=1 (an accessibility barrier), and layouts built on fixed pixel widths instead of media queries.
Is the test free, and do I need an account? The test is free and requires no login or email address. Mobile signals form part of the full SEOMaster audit, which scores eight pillars: SEO, performance, security, accessibility, trust and content, hosting and DNS, email, and AI readiness.