SiteAud!tLint Support

Warning Accessibility

Missing viewport meta tag

Severity
Warning
Impact
High
Effort to fix
Low
Issue code
viewport_missing

Why it matters

Without a viewport tag the page will not render properly on mobile devices, which affects mobile-first indexing.

How to fix it

Add <meta name="viewport" content="width=device-width, initial-scale=1">.

What this means

The page has no viewport meta tag. Without it, phones render the page at a desktop width of about 980 pixels and shrink it to fit the screen, so text is tiny and visitors have to pinch and zoom.

The standard tag, inside <head>:

<meta name="viewport" content="width=device-width, initial-scale=1">

Why it matters for SEO

Google indexes the mobile version of every page. A page without a viewport tag is not mobile friendly by definition, which hurts the mobile experience Google evaluates and the engagement of mobile visitors, often the majority of traffic.

Common causes

  • An old template or a hand-built landing page created before responsive design.
  • A custom <head> in one page type, such as a campaign page, that skipped the shared layout.
  • HTML generated by an email builder, PDF converter or embedded app and published as a web page.

How to fix it

  1. Add the tag above to the <head> of the layout template.
  2. Do not add maximum-scale=1 or user-scalable=no. They stop visitors from zooming, which fails accessibility guidelines, and modern browsers often ignore them anyway.
  3. Check the page on a phone. The tag only tells the browser to use the device width; a layout with fixed-width elements still needs responsive CSS to fit.

Verify the fix

Recrawl. If many pages share the template, they clear together. Then open one fixed page on a real phone, or in the browser's device toolbar, and confirm text is readable without zooming and nothing scrolls sideways.

How it affects your score

Finding this issue on any page costs the Accessibility score 3 points, plus up to 12 more depending on the share of crawled pages affected. Weakens rankings, crawling or measurement. Fix after critical issues.

Find the affected URLs

Open Crawl > Issues and pick Missing viewport meta tag. Each affected URL is listed with its evidence, and Copy URLs or Export URLs hands the list to a developer. The issue also appears in the Action Plan, ranked by impact (high) and effort (low), and in the issues CSV under the code viewport_missing. After fixing, run a new audit and use Compare to confirm the URLs moved to fixed.