Mobile-First Indexing
Mobile-first indexing means Google predominantly uses the mobile version of a website's content for indexing and ranking, rather than the desktop version.
Since July 2019, all new websites default to mobile-first indexing. Since March 2024, Google has completed the transition — all websites are now indexed mobile-first.
This means your mobile site is your site in Google's eyes. Content hidden behind tabs, accordions, or truncated on mobile may receive less weight. Ensure your mobile version has the same content, structured data, meta tags, and internal links as desktop.
Responsive design (single URL, CSS-based layout changes) is the recommended approach. Separate mobile URLs (m.example.com) require hreflang-like annotations and are harder to maintain. Next.js with Tailwind CSS naturally produces responsive layouts.
Related terms
Core Web Vitals
Core Web Vitals are a set of three Google metrics — Largest Contentful Paint (LCP), Interaction to Next Paint (INP), and Cumulative Layout Shift (CLS) — that measure real-world user experience.
Page Speed
Page speed is the measurement of how quickly a web page's content loads and becomes interactive, typically measured by metrics like Time to First Byte (TTFB), First Contentful Paint (FCP), and Largest Contentful Paint (LCP).
Technical SEO
Technical SEO encompasses the server-side and infrastructure optimizations that help search engines efficiently crawl, render, index, and rank your website's content.
Stop shipping broken SEO
Indxel validates your metadata, guards your CI/CD pipeline, and monitors indexation — so you never miss an SEO issue again.