Mobile Responsiveness Checker: Test Your Site in Seconds
Enter your URL and get a mobile responsiveness report in seconds, with clear findings and fixes for viewport, text size, and tap targets.
Free with a Brainito account. No credit card required.
Instant Mobile Audit
Scan any page in seconds and see exactly where your layout breaks on phones and tablets, no setup or code needed.
Clear, Actionable Fixes
Every issue comes with a plain-language recommendation, so you know what to change and why it matters for rankings.
Built for Mobile-First SEO
Google indexes the mobile version of your site first, so catching responsive issues early protects your visibility.
Frequently Asked Questions
What does the Mobile Responsiveness Checker test?
It analyzes your URL for common mobile issues like a missing viewport tag, content wider than the screen, small font sizes, and cramped tap targets, then returns findings with clear recommendations for each one.
Is the Mobile Responsiveness Checker free to use?
Yes. The tool is free after creating a Brainito account. Once you sign up, you can run checks on any page, review the findings, and rerun the test after making fixes to confirm they worked.
Why does mobile responsiveness matter for SEO in 2026?
Google uses mobile-first indexing, so the mobile version of your site is what gets crawled and ranked. Pages that are hard to use on phones tend to lose visitors and rankings, which makes regular mobile checks part of healthy technical SEO.
Find and fix your mobile issues before they cost you rankings.
One account unlocks mobile responsiveness checker plus 340+ marketing tools, weekly audits, and your action plan.