Mobile SEO is no longer a niche consideration — it is the primary consideration. Google's mobile-first indexing (fully rolled out in 2023) means Google predominantly uses the mobile version of your site for indexing and ranking. If your mobile site is lacking, your desktop rankings suffer too.
Mobile-First Indexing
Google crawls and indexes the mobile version of your website as the primary version. If content exists only on desktop (hidden on mobile), Google does not see it. If your mobile page speed is slow, that is what Google measures for Core Web Vitals. Desktop performance is secondary.
Mobile Usability Requirements
Legible text without zooming (minimum 16px font), adequate spacing between tap targets (minimum 48px × 48px tap area), no horizontal scrolling, content fits viewport without overflow, no use of deprecated technologies (Flash), and fast load times on 3G/4G connections.
Responsive Design vs Separate Mobile Site
Responsive design (single URL, CSS adapts layout) is Google's recommended approach. It is easier to maintain, avoids duplicate content issues, and consolidates link equity. Separate mobile sites (m.subdomain.com) require additional SEO management (canonical tags, redirects) and are generally discouraged for new builds.
Mobile Core Web Vitals
Core Web Vitals are measured separately for mobile and desktop, and mobile performance is the primary signal. Mobile LCP scores are typically 40–60% worse than desktop due to slower connections and less powerful processors. Optimize specifically for mobile: smaller images, deferred JavaScript, minimal above-the-fold CSS.
Mobile Keyword Research
Mobile search behavior differs from desktop. Voice searches (longer, conversational queries), "near me" searches, and micro-moment searches ("quick" intent) are more common on mobile. Ensure your content addresses these mobile-specific search patterns.
AMP (Accelerated Mobile Pages)
AMP is a Google-developed framework for instant-loading mobile pages. It has fallen out of favor since Core Web Vitals provide a more holistic performance standard. AMP is no longer required for Google's Top Stories carousel. Focus on Core Web Vitals optimization rather than AMP unless your site already uses it.