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Performance · Free Tool

Free Mobile-Friendly Test

Google uses mobile-first indexing — your mobile experience directly affects rankings. This tool checks for a proper viewport meta tag, font sizes readable on small screens, tap target sizes (Google recommends 48×48px minimum), and runs a full mobile performance audit.

scheduleSpeed tests typically take 15–30 seconds.

What This Tool Checks

  • check_circleMobile performance score (Lighthouse on simulated Moto G Power)
  • check_circleViewport meta tag check: content="width=device-width, initial-scale=1"
  • check_circleMobile Core Web Vitals: LCP, CLS, INP on mobile
  • check_circleFont size legibility: text must be 12px+ to avoid zoom requirements
  • check_circleTap target size: buttons/links should be 48×48px minimum
  • check_circleContent wider than screen detection (horizontal scrolling issue)
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Why This Matters for SEO

Google switched to mobile-first indexing in 2019 — meaning Google primarily uses the mobile version of your site for indexing and ranking. If your mobile experience is poor, it directly hurts your search rankings. Over 60% of all web searches now come from mobile devices. A site that works perfectly on desktop but poorly on mobile is losing rankings and revenue.

Want this audit running on every page of your site, every day? See PerfBee Performance Boost — Continuous Core Web Vitals monitoring with deploy comparisons and AI fix suggestions.

Frequently Asked Questions

What is mobile-first indexing?expand_more
Mobile-first indexing means Google predominantly uses the mobile version of your website's content for indexing and ranking. Before 2018, Google indexed the desktop version. Now, if your mobile site has less content than your desktop site, is missing structured data, or has different meta tags, Google sees the inferior mobile version — which directly affects rankings. All new sites have been mobile-first indexed since 2019.
How do I make my website mobile-friendly?expand_more
Key steps to make a site mobile-friendly: (1) Add a viewport meta tag (<meta name="viewport" content="width=device-width, initial-scale=1">). (2) Use responsive design (CSS that adapts to screen size). (3) Ensure text is at least 16px for body text. (4) Make tap targets (buttons, links) at least 48×48 pixels. (5) Avoid horizontal scrolling. (6) Optimize images for mobile. (7) Minimize JavaScript blocking the main thread.
What is the viewport meta tag?expand_more
The viewport meta tag (<meta name="viewport" content="width=device-width, initial-scale=1">) tells mobile browsers how to scale your page. Without it, mobile browsers render the page as if it were 960px wide and then shrink it to fit the screen — making text tiny and unreadable. With it, the browser renders at the device's actual width. This is the most basic mobile-friendliness requirement.
Why is my mobile score lower than desktop?expand_more
Lighthouse tests mobile using a simulated slow device (Moto G Power) on a throttled 4G connection, while desktop uses a faster connection and no device throttling. Mobile devices have less CPU and memory than desktop, so JavaScript takes longer to execute. Most sites score 15–40 points lower on mobile. If your mobile score is under 50, it likely indicates real performance problems for actual mobile users.
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Track mobile performance across every page

PerfBee runs mobile and desktop Lighthouse audits on all your pages — so you can see exactly which pages fail on mobile and exactly what to fix. Get daily crawl reports, broken link alerts, Core Web Vitals tracking, and AI fix suggestions — across your entire site.

  • checkCrawl unlimited pages — daily, automatic
  • checkBroken link detection across your whole site
  • checkCore Web Vitals & Lighthouse audits per page
  • checkAI-powered code fix suggestions
  • checkWhite-label PDF reports for clients
  • checkEmail alerts for new issues & downtime
Start Free Mobile Auditarrow_forwardView Pricing

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