Free Tool · No Sign-Up
Free Mobile Viewport Checker
Enter your domain. We check whether your page declares a valid <meta name="viewport"> tag, which mobile rendering depends on.
This checks 1 thing. HellSEO's full audit scores 24 checks across SEO, AEO, and GEO — including backlink authority and score history this page doesn't cover.
See Full ScoreHow It Works
We fetch your page's HTML and look for a <meta name="viewport"> tag.
If found, we check its content for the two values that matter most: width=device-width (matches the viewport to the device) and initial-scale=1 (starts at 100% zoom).
This is a static HTML check — no rendering, no screenshots, nothing stored.
Who Uses This
New site launches
Confirm the baseline mobile setup is in place before assuming responsive CSS will work.
Legacy site audits
Older sites built before mobile-first design sometimes never got this tag added.
Agencies
Quick check alongside a broader technical SEO audit.
Frequently Asked Questions
What's the standard viewport tag?
<meta name="viewport" content="width=device-width, initial-scale=1" /> — this is the baseline nearly every responsive site uses.
Does this guarantee my site is mobile-friendly?
No — it only checks that the viewport tag exists and is set correctly, which is the prerequisite for responsive CSS to work at all. Actual layout, tap target sizing, and font size still depend on your CSS.
What happens without this tag?
Mobile browsers render the page at a fixed desktop-width viewport (typically 980px) and scale it down, making text tiny and forcing users to pinch-zoom — a classic "not mobile-friendly" signal.
Should I ever set maximum-scale=1 or user-scalable=no?
Generally no — disabling pinch-zoom is an accessibility problem for users who need to zoom text. It's not part of what this checker flags as required.
Want the full picture?
This tool checks one thing. A full HellSEO audit scores your site across SEO, AEO, and GEO — and gives you ready-to-paste fixes.
Run a Full Audit