Mobile-First Indexing: What It Means for Your Site

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Mobile-First Indexing: What It Means for Your Site – SEOTT guide

Mobile-first indexing means Google primarily uses the mobile version of a page’s content for crawling, indexing and ranking. Since July 2024 it applies to essentially every website, so whatever is missing on your mobile pages is, as far as Google is concerned, missing from your site. It is a key consideration in technical SEO.

Why Google switched

Most searches now happen on phones. Ranking pages based on desktop content led to frustrating results: users clicked a result and landed on a mobile page that lacked the information they expected. Indexing the mobile version first fixes that mismatch.

What it means in practice

If you use a responsive design, the same HTML serves every device and you are usually fine. Problems appear when the mobile experience is different:

  • Text hidden behind tabs that never loads on mobile.
  • Fewer internal links in the mobile menu or footer.
  • Structured data present only on the desktop template.
  • Images or videos removed on small screens.
  • Different title tags or meta descriptions on a separate m. subdomain.

Mobile-first checklist

  1. Use responsive design wherever possible.
  2. Make sure the main content is identical on mobile and desktop.
  3. Keep the same headings, internal links and image alt text.
  4. Add the same schema markup to both versions.
  5. Do not block resources in robots.txt that the mobile page needs.
  6. Avoid lazy-loading primary content that appears only on scroll or tap.
  7. Check Core Web Vitals on mobile, where they are usually weaker.

Content in tabs and accordions

Content inside collapsible sections is indexed normally under mobile-first indexing, as long as it is present in the HTML when the page loads. Using accordions to keep long pages tidy on phones is fine.

Separate mobile sites (m-dot)

If you still run m.example.com, you need matching content, rel=”alternate” and canonical annotations between versions, and equivalent structured data and metadata. Most businesses are better off moving to a responsive site.

How to test

  • Use URL Inspection in Search Console and view the crawled page as Googlebot smartphone.
  • Check the rendered HTML for missing content or links.
  • Run Lighthouse in Chrome DevTools with mobile emulation.
  • Browse your own site on a real phone, using the menu and search like a customer would.

Frequently asked questions

Does my desktop site still matter?

For users, yes. For Google’s index, the mobile version is what counts.

Is there a mobile-friendly test tool?

Google retired its standalone test in 2023. Use Lighthouse or URL Inspection instead.

Related terms

See how search engines crawl and index, JavaScript SEO and the SEO encyclopedia.

Mr. SEO is the webmaster at SEO TT - SEO tips and tricks, a publication about all things SEO related.