ARTICLE
Mobile-First Indexing and What It Means
Google indexes the mobile version of your site first. What this means for your clients' SEO, common mobile issues, and how to test.
Apr 15, 20264 min read
SEO for Agenciesmobile-firstmobile SEOindexingresponsive design
Google crawls mobile first, desktop second
Since 2023, Google has used mobile-first indexing for all websites. This means Google primarily uses the mobile version of your content for indexing and ranking. If content exists on your desktop site but not your mobile site, Google may not index it.
For agencies, this has a direct implication: if your client's mobile experience is poor, their rankings suffer — even if the desktop version is perfect.
What mobile-first indexing actually changes
Content parity
Every piece of content on the desktop version must also be on the mobile version. Common violations:
- Text hidden behind "read more" or accordion buttons on mobile (Google may devalue it)
- Images present on desktop but replaced with smaller versions or removed on mobile
- Tables that are visible on desktop but horizontally scrollable/truncated on mobile
- Navigation items accessible on desktop but hidden in a hamburger menu
Structured data
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