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Mobile-first indexing means Google primarily uses the mobile version of your site for indexing and ranking — even for desktop search queries. Since 2023, all new sites default to mobile-first indexing. If your mobile site has less content, fewer links or missing structured data compared to your desktop site, your rankings will be based on that inferior mobile version.
This tool checks your page against Google's mobile SEO requirements: responsive design or mobile-specific CSS, text legibility without zooming (minimum 16px font), tap targets sized correctly (44×44px minimum), no mobile-unfriendly plugins (Flash), viewport meta tag presence, page load speed on mobile, and Core Web Vitals (LCP, FID, CLS) performance on mobile connections.
Google's Core Web Vitals target is Largest Contentful Paint (LCP) under 2.5 seconds on mobile. Pages that load in under 2 seconds have measurably higher conversion rates and are favoured in mobile rankings. Every 1-second delay in mobile load time reduces conversions by approximately 7%. Prioritise image optimisation, lazy loading and server response time for mobile speed gains.
The most impactful mobile SEO fixes are: switch to a responsive design framework, compress and serve images in WebP format, defer non-critical JavaScript, use a CDN, set the viewport meta tag (<meta name='viewport' content='width=device-width, initial-scale=1'>), increase touch target sizes with CSS padding, and replace Flash with HTML5 equivalents.