In short. Google calls for equivalent primary content, titles and meta descriptions, with the same structured data on mobile and desktop and appropriate mobile URLs.
Definition: As of 17 October 2026, Google uses the mobile version of a site's content for indexing and ranking, a system called mobile-first indexing. Its guidance calls for equivalent primary content, titles and meta descriptions, with the same structured data on mobile and desktop.
Key facts
- Google's mobile-first indexing guidance permits mobile layouts that place equivalent content in accordions or tabs and calls for the same clear, meaningful headings.
- Google's title-link documentation identifies the HTML title, the visible main title and heading elements as sources for the clickable title in search results.
- Google's structured data guidelines recommend placing the same markup on duplicate pages, on every duplicate URL.
Which text must remain available on mobile?
Google's mobile-first guide calls for the mobile site's primary content to be equivalent to the desktop site's content. It explicitly permits a different mobile design, including accordions and tabs that save space.
Content availability also depends on loading behavior. The same guide says Google does not load primary content that requires swiping, clicking or typing to load. Content already available in an accordion and content fetched only after a click therefore require different checks.
For images, Google calls for matching alternative text, which describes an image in HTML, and the same relevant titles, captions, filenames and surrounding text.
Which metadata must match?
Metadata is information about a page expressed in its HTML. Google's mobile-first guide calls for equivalent title elements and meta descriptions across both versions. It also calls for the same robots meta tags, which instruct crawlers about indexing and other processing; a mobile-only noindex instruction can prevent indexing.
Google's title-link guidance recommends descriptive, concise title text for each page. It gives this HTML example for an account-registration page:
<title>ExampleSocialSite: Sign up for a new account.</title>
Google's snippet documentation describes a meta description as a short, relevant summary of a page. It recommends descriptions specific to individual pages, using page-level descriptions beyond the home page and other aggregation pages. Mobile and desktop descriptions therefore need to remain equivalent for each corresponding page, while descriptions across different pages reflect their respective content.
What must match in structured data, and how is it checked?
Structured data is markup that describes page content in a machine-readable form. Google's mobile-first guide calls for the same structured data on both versions. It names Breadcrumb, Product and VideoObject as priorities if implementation must be staged. For mobile versions, URLs within the markup must be updated to the mobile URLs.
Google's general structured data guidelines require markup to represent the page's content accurately. Their example says that when markup describes a performer, the HTML body must describe that same performer. The guidelines also require all properties designated as required for the relevant rich result type, a search appearance with additional features.
The same guidelines identify the Rich Results Test and URL Inspection tool as checks that catch most technical errors. The mobile-first guide specifically recommends URL Inspection to check whether content is visible on the rendered page, the page as Google sees it.
Related terms
FAQ
Must mobile and desktop have the same layout?
You can use different layouts. Google's mobile-first guide permits accordions and tabs with equivalent content; responsive design serves the same HTML at the same URL while adapting its display to screen size.
Will matching descriptions produce identical search snippets?
Google's snippet documentation says snippets primarily come from page content and can differ by search query. It sometimes uses the meta description when that provides a more accurate summary, and truncates snippets as needed to fit the device width.
Sources
- Google Search Central, "Mobile-first indexing best practices", 10 December 2025
- Google Search Central, "Influencing your title links in search results", 10 December 2025
- Google Search Central, "General structured data guidelines", 10 July 2026
- Google Search Central, "Control your snippets in search results", 20 April 2026
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