Introduction
Google officially moved to mobile-first indexing for all websites in 2024, meaning the mobile version of your site is the primary version used for indexing and ranking.
Responsive Design
Use a single responsive URL structure rather than separate m.domain.com subdomains.
Mobile Page Speed
Mobile users are often on slower connections. Aim for a Largest Contentful Paint (LCP) under 2.5 seconds on 4G.
Tap Targets and Readability
Ensure all buttons and links have a minimum tap target size of 48x48 CSS pixels. Use a base font size of at least 16px.
Avoid Intrusive Interstitials
Google penalises pages that show large pop-ups or interstitials on mobile before users can see the main content.
Conclusion
Mobile-first SEO is not a separate discipline — it is simply the baseline expectation for 2025.