Mobile-First Indexing
Google's approach where the mobile version of a website is the primary version for indexing.
Mobile-first indexing means Google primarily uses the mobile version of your website for indexing — bibliotheekterm and ranking. Since 2023, this is the default for all websites. If your mobile version contains less content than your desktop version, you may lose rankings.
What does this mean in practice?
Ensure your mobile and desktop versions contain the same content, structured data — bibliotheekterm, and metadata. Responsive design is the simplest way to guarantee this. Check that images have alt text, internal links — bibliotheekterm work, and robots meta tags are consistent.
Mobile-first and AI bots
Most AI bots crawl the desktop version of your site. But Googlebot uses the mobile version for indexing, which indirectly affects your visibility in Google's AI features. Both versions must be optimal.
Mobile-first audit checklist
- Content parity: does the mobile version contain exactly the same text, images, and videos as the desktop version? Hidden content behind accordions or tabs counts, as long as it's present in the DOM.
- Structured data: are all JSON-LD blocks (Article, Organization, FAQPage, BreadcrumbList) present on both mobile and desktop?
- Meta tags: are title, meta description — bibliotheekterm, canonical, hreflang — bibliotheekterm, and robots tags identical on mobile and desktop?
- Images: do all images on mobile have an alt attribute? Are they loaded in comparable quality (not just thumbnails)?
- Internal links: are all internal links that exist on desktop also available on mobile? Hamburger menus count, but entirely missing links don't.
- Loading speed: does the mobile version meet Core Web Vitals — bibliotheekterm (LCP ≤ 2.5s, INP ≤ 200ms, CLS ≤ 0.1)? Test with PageSpeed Insights on mobile.
- Touch targets: are buttons and links at least 48x48px and have sufficient spacing (minimum 8px) from other clickable elements?
- Viewport meta tag: is
<meta name="viewport" content="width=device-width, initial-scale=1">present? - No horizontal scrolling: does all content fit within the viewport without horizontal scrolling?
- Readable text: is text at least 16px on mobile? Does the user need to zoom to read?
- Correct lazy loading: are above-the-fold images not lazy-loaded? Lazy loading the hero image delays LCP.
- Pop-ups and interstitials: are there no full-screen pop-ups blocking content on mobile? Google penalizes intrusive interstitials.
Frequently asked questions
What if my site doesn't have a mobile version?
If your site isn't responsive and doesn't have a separate mobile version, Google indexes the desktop version. But rankings will suffer because the mobile user experience is poor, and that's a negative signal.
Is responsive design the only option for mobile-first?
No, Google supports three configurations: responsive design (recommended), dynamic serving (different HTML per device), and separate mobile URLs (m.example.com). Responsive design is simplest and least error-prone.
How do I check what Google sees as the mobile version?
Use the URL Inspection tool in Google Search Console. Choose "Test Live URL" and view the rendered page. You'll see exactly what Googlebot's mobile crawler picks up.
Does hidden content behind tabs and accordions count?
Yes, Google indexes content behind tabs and accordions, as long as it's present in the HTML DOM (not lazy-loaded on click). Google considers this content as "full weight" in ranking.
Does mobile-first indexing affect how AI bots see my site?
Indirectly. Most AI bots (GPTBot, ClaudeBot) crawl the desktop version. But if Google indexes your site based on the mobile version and it contains less content, your visibility in Google's AI features may decrease.
