Is this website mobile-friendly?
Type a website address. We read its viewport tag, CSS, font sizes, images, page weight and HTTPS, and list each problem a phone visitor would hit. Google retired its own mobile-friendly test in December 2023. Free, no account.
Example: a sample plumber's page we wrote for this demo (smithplumbing.example is not a real site). Type any website above for a live check.
Works on phones, with several problems
Works on phones, with several problems: smithplumbing.example has 0 failures and 5 warnings in a static read of its HTML and CSS.
- Warning: Viewport. The viewport is set to the screen width, but zooming is turned off (user-scalable=no or maximum-scale=1), which makes small text hard to read.
- Warning: Responsive CSS. No width-based media queries found in the CSS we read. We read 1 inline style block and 1 of 1 linked stylesheet. The layout may not adapt to phones.
- Warning: Fixed widths. Widths of 900 pixels or more set outside media queries (960px). On a phone these push content off the side of the screen.
- Warning: Font sizes. Text set smaller than 12px (10px, 11px). Lighthouse treats text under 12px as too small to read on a phone.
- Note: Tap targets. Tap target size needs a rendered page to measure; none of the links' own styles make them tiny.
- Pass: Click to call. 1 tel: link, so phone visitors can call in one tap.
- Warning: Images. 1 image: 1 without width and height set, 1 without srcset (one size for every screen). Largest of the 1 we sized: 1,210 KB. 1 is over 500 KB, slow on a phone connection.
- Pass: Page weight. The HTML is 1 KB, plus 1 script and 1 stylesheet.
- Pass: HTTPS. The page loads over HTTPS.
What this test checks, and what it cannot
Google retired its Mobile-Friendly Test, the test's API and the Search Console Mobile Usability report starting 1 December 2023, and pointed site owners to Lighthouse instead (Google's April 2023 announcement, checked 8 Nov 2026). This tool is a quick static check: we read the page's HTML and up to 2 of its stylesheets and look for the causes of the problems Google's old test reported:
- Viewport: without
width=device-widtha phone shows the desktop layout shrunk down. - Responsive CSS and fixed widths: media queries that change the layout by screen width, and fixed widths of 900px or more outside them.
- Font sizes: CSS that sets text under 12px.
- Tap targets: links and buttons whose own styles make them under 24px tall. True tap target size needs a rendered page, so the rest is marked as a note.
- Images and page weight: images without set sizes or srcset, the size of up to 4 images, and the size of the HTML.
- HTTPS, click to call, and old technology such as Flash or frames.
We do not run the page's JavaScript or take a screenshot, so a page that builds its layout in JavaScript can pass or fail here differently from a real phone. For a full rendered test, run Lighthouse in Chrome's developer tools.
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Questions
No. Google retired the Mobile-Friendly Test, its API and the Search Console mobile usability report starting 1 December 2023 and points to Lighthouse instead.
A viewport set to the device width, a layout that adapts with media queries, text of at least 12px, tap targets large enough for a thumb, and a page light enough to load on a phone connection.
No. It reads the HTML and CSS without running JavaScript, which is fast and catches the common causes, but it is not a screenshot on a real phone.
No. Each test reads the page once and nothing is saved.
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