How it works
- Paste the full URL of the page you want to test (for example
https://example.com). - The tool fetches the live page and parses its
<head>and markup. - It checks the viewport meta tag, responsive hints and common mobile pitfalls.
- You get a clear pass/warn list explaining each signal and how to fix it.
What it checks
- Viewport meta tag — presence of
width=device-width, initial-scale=1. - Fixed-width layout — fixed pixel widths that break on small screens.
- Text scaling — whether
user-scalable=noor tiny font sizes block readability. - Charset and HTML lang — basic rendering and localization signals.
- Tap-friendly hints — markup that suggests cramped or oversized elements.
- HTTPS delivery — secure pages that mobile browsers trust.
Common use cases
- Theme testing — confirm a new template is responsive before launch.
- Mobile-first readiness — make sure Google sees a usable mobile page.
- Landing pages — verify campaign pages convert well on phones.
- Quick diagnostics — explain why a page feels broken on a small screen.
Example
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.
Frequently asked questions
Is the Mobile-Friendly Checker free?
Yes — completely free, with no signup and no usage limits. Test as many URLs as you like.
Does a viewport tag guarantee mobile-friendliness?
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.
What else affects mobile rankings?
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.