Mobile SEO in 2026 — Google Mobile-First Indexing Guide

Google has used mobile-first indexing since 2020. If your site does not work on phones, you are invisible.

1. Responsive design is mandatory
2. 53 percent of mobile visitors leave sites slower than 3 seconds
3. Short paragraphs. 16px minimum font. No horizontal scrolling.
4. Test with Google Mobile-Friendly Test tool

Most small business sites fail on mobile. Check yours.

SEO Spark — mobile-friendly content in 60 seconds. 3 free.