📱 Mobile Friendly Checker

Open Interactive Mobile Friendly Checker →

What is Mobile Friendly Checker?

Check viewport and responsive indicators — one of 2,142 free utilities on this site. It belongs to the Technical SEO group inside SEO Tools.

Because everything runs client-side, it also works for confidential material — client drafts, unreleased campaigns, internal data — with nothing transmitted or logged.

How Mobile Friendly Checker works

1. Paste your HTML or content into the input box.
2. Press Analyze — the checker parses your input in your browser.
3. Review the pass/warn/fail table and fix the flagged items.

Mobile Friendly Checker — FAQs

Why the Mobile Friendly Checker matters

Consistency beats talent. Teams that check their technical seo work against a repeatable process ship fewer embarrassing mistakes, and the Mobile Friendly Checker is that process, available on every page load.

Learning by doing beats learning by reading. Paste real material into the Mobile Friendly Checker, watch how the results change with your edits, and you build intuition for technical seo that no course can teach.

Manual checks are fine once, but nobody repeats a manual checklist reliably. The Mobile Friendly Checker encodes the checklist once and applies it identically every time you run it.

Common use cases

• t => `Auditing legacy content — running old ${t.subcategory.toLowerCase()} assets through current standards.`
• t => `Routine health checks: a monthly sweep of key pages, recorded and compared over time.`
• t => `Teaching: juniors learn standards faster when a table says PASS or FAIL with reasons.`
• t => `Post-mortems: checking whether the version you shipped matches the checklist you promised.`
• t => `Agency handovers: documenting the state of deliverables with an objective pass/warn table.`

Mobile Friendly Checker tips that save time

• t => `Keep the results table in your QA doc; a dated record of pass/fail states makes regressions obvious weeks later.`
• t => `If every row fails at once, check that you pasted complete markup — a truncated copy produces misleading results.`
• t => `Re-run the ${t.name} after every fix — the pass/warn table should shrink visibly between runs, which is your proof of progress.`
• t => `Paste the final rendered version of your content (what users actually see), not the draft with placeholders.`
• t => `Analyze a representative sample, not a cherry-picked snippet — the ${t.name} can only report on what you paste into it.`

What goes wrong with technical seo — and how to prevent it

• t => `Treating WARN as FAIL: warnings are judgment calls to review, not emergencies to fix.`
• t => `Pasting partial or truncated markup — the ${t.name} grades exactly what it receives, so incomplete input yields incomplete verdicts.`
• t => `Optimizing for the checker instead of the user — the table guides priorities, it does not replace judgment.`
• t => `Ignoring repeated patterns across pages: one page's FAIL is a template, and templates deserve one fix in one place.`

Terms used on this page

• Dwell time — how long a visitor stays before returning to results — a soft signal of content satisfaction.
• CAC — Customer Acquisition Cost — total sales + marketing spend divided by customers gained.
• SERP — Search Engine Results Page — the ranked list a query returns; position drives traffic exponentially.
• Canonical URL — the preferred address of duplicate content — consolidates ranking signals to one URL.

More Technical SEO tools

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• ✅ Robots.txt Validator — Validate robots.txt file syntax
• 🗺️ XML Sitemap Generator — Generate XML sitemap from URL list
• ✔️ Sitemap Validator — Validate XML sitemap structure
• 📋 Schema Markup Generator — Generate JSON-LD structured data
• 🔎 Schema Validator — Validate JSON-LD schema markup
• 📡 HTTP Status Code Checker — Look up and explain HTTP status codes
• ↪️ URL Redirect Checker — Check redirect chains and status codes