Google mobile-first indexing
Google mobile-first indexing,
as documented
Which version of your pages Google indexes and what to keep the same on mobile and desktop, in Google's own words. Verified from Google's pages on 2026-10-07.
Google says it uses the mobile version of a site's content, crawled with the smartphone agent, for indexing and ranking, and calls this mobile-first indexing. This page lists what Google documents about mobile sites and mobile-first indexing, with the wording taken from its page.
What Google documents
| Topic | What Google says | Source |
|---|---|---|
| What it is | “Google uses the mobile version of a site's content, crawled with the smartphone agent , for indexing and ranking.” | Google docs Verified 2026-10-07 |
| Is a mobile version required? | “While it's not required to have a mobile version of your pages to have your content included in Google's Search results, it is very strongly recommended.” | Google docs Verified 2026-10-07 |
| Responsive design | “Google recommends Responsive Web Design because it's the easiest design pattern to implement and maintain.” | Google docs Verified 2026-10-07 |
| Dynamic serving | “This configuration relies on user-agent sniffing and the Vary: user-agent HTTP response header to serve a different version of the HTML to different devices.” | Google docs Verified 2026-10-07 |
| Responsive pages | “In case of responsive design, the content and the metadata are the same on the mobile and desktop version of the pages.” | Google docs Verified 2026-10-07 |
| Robots meta tags | “Use the same robots meta tags on the mobile and desktop site.” | Google docs Verified 2026-10-07 |
| Different robots tags | “If you use a different robots meta tag on the mobile site (especially the noindex or nofollow tags), Google may fail to crawl and index your page when your site is enabled for mobile-first indexing.” | Google docs Verified 2026-10-07 |
| Lazy-loading | “Don't lazy-load primary content upon user interaction.” | Google docs Verified 2026-10-07 |
| Interaction-loaded content | “Google won't load content that requires user interactions (for example, swiping, clicking, or typing) to load.” | Google docs Verified 2026-10-07 |
| Blocked resources | “If you want Google to crawl your URLs, make sure that you're not blocking the URL with the disallow rule .” | Google docs Verified 2026-10-07 |
| Same content | “Make sure that your mobile site contains the same content as your desktop site.” | Google docs Verified 2026-10-07 |
| Less content on mobile | “If it's your intention that the mobile page should have less content than the desktop page, you can expect some traffic loss when your site is enabled mobile-first indexing, since Google can't get as much information from your page as before.” | Google docs Verified 2026-10-07 |
| Accordions and tabs | “You can have a different design on mobile to maximize user experience (for example, moving content into accordions or tabs); just make sure that the content is equivalent to the desktop site, since indexing on your site comes from the mobile site.” | Google docs Verified 2026-10-07 |
| Headings | “Use the same clear and meaningful headings on the mobile site as you do on the desktop site.” | Google docs Verified 2026-10-07 |
| Structured data | “Make sure that your mobile and desktop sites have the same structured data.” | Google docs Verified 2026-10-07 |
| Metadata | “Make sure that the title element and the meta description are equivalent across both versions of your site.” | Google docs Verified 2026-10-07 |
| Image URLs | “Don't use URLs that change every time the page loads for images.” | Google docs Verified 2026-10-07 |
| Alt text | “Make sure that the mobile site has the same alt text for images as the desktop site.” | Google docs Verified 2026-10-07 |
Rules to remember
- Google says it uses the mobile version of a site's content for indexing and ranking.
- Google says to keep the main content, headings, structured data, titles and descriptions the same on mobile and desktop.
- Google says to use the same robots meta tags on both and not to hide primary content behind interactions.
Questions
What is mobile-first indexing?
Google says it uses the mobile version of a site's content, crawled with the smartphone agent, for indexing and ranking. It is not required to have a mobile version to be included in Search results, but Google says it is very strongly recommended.
Which mobile setup does Google recommend?
Responsive design: the same HTML on the same URL for every device, displayed differently by screen size. Google recommends it because it's the easiest design pattern to implement and maintain. Dynamic serving and separate URLs are the other two configurations it describes.
Can my mobile page have less content than the desktop page?
Google says that if the mobile page intentionally has less content, you can expect some traffic loss under mobile-first indexing, since indexing comes from the mobile site. It suggests moving content into accordions or tabs rather than removing it.
Does lazy-loading hurt indexing?
Google says not to lazy-load primary content upon user interaction, because it won't load content that requires interactions such as swiping, clicking or typing to load.
Should the robots meta tags be identical on mobile and desktop?
Google says to use the same robots meta tags on both, and that a different tag on the mobile site, especially noindex or nofollow, may make Google fail to crawl and index the page when the site is enabled for mobile-first indexing.
What else should match between mobile and desktop?
Google lists the main content, headings, structured data, the title element and meta description, and for images the same alt text and image URLs. For images it says different image URLs can cause a temporary image traffic loss during the transition.
How current is this page?
Every row was read from Google's page on 2026-10-07, which showed "Last updated 2025-12-10 UTC". Google can change its documentation, so treat the linked page as the final word.
Sources
- Mobile site and mobile-first indexing best practices (Google Search Central), read on 2026-10-07
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