SEO Auditor

About

SEO Auditor — On-Page SEO Audit Tool, SEO Analyzer, SEO Checker

✅ Instant SEO Audit. Full Analysis. Zero Guesswork.
SEO auditor is your powerful all-in-one Chrome extension that provides deep, structured, and real-time SEO audits directly on any webpage — fully client-side, privacy-friendly, fast, and actionable.
Whether you're a website owner, SEO consultant, developer, marketer, or agency — SEO Analyzer empowers you to optimize your pages effortlessly with scientific, well-structured insights.

🚀 Key Features At a Glance:
✅ LLM SEO (AI Mentions Improvers)
- llms.txt existence checker
- llms-full.txt existence checker

✅ Meta Tag Analyzer
- Analyze & validate all critical meta tags
- Title tag length checker with Google-recommended limits
- Meta description length checker with recommendations
- Canonical tag existence and correctness
- Robots meta tag (robots + x-robots-tag) parsing
- Open Graph (og:) and Twitter Card tag validation
- JSON-LD structured data extraction and display
- Viewport and charset tag validation
- Language attribute (html lang) detection
- Favicon existence check

✅ Advanced Headings Structure Audit
- Fully hierarchical breakdown: H1, H2, H3, H4, H5, H6 counts
- Detect missing or multiple H1 tags
- Highlight heading depth structure for semantic optimization
- Identify hierarchy problems visually

✅ Image Optimization Audit
- Full image listing with and without alt attributes
- Detect accessibility issues from missing alt tags
- Identify images missing srcset attributes for responsive design
- Review image source URLs directly

✅ Link Analysis (Internal & External)
- Total link count with full breakdown
- Internal vs external link categorization
- nofollow and target="_blank" attribute detection
- Unique URL counts
- Anchor text audits: empty text, short text flags
- Full clickable list of all links with attributes

✅ Indexability & Crawlability Audit
- Analyze indexability based on robots meta tags
- Fetch and display robots.txt (when permissions allow)
- Fetch and parse sitemap.xml file (when available)
- Check if the current page is included in sitemap

✅ Accessibility Signals
- HTML lang attribute detection
- Alt attribute coverage on images
- Semantic heading structure
- Missing metadata flags for accessibility

✅ Content Depth Analysis
- Word count calculation
- Character count calculation
- Flagging thin content when pages have too few words

✅ Technical SEO Checks
- Charset detection
- Viewport tag presence for mobile responsiveness
- Structured data (JSON-LD) inspection with inline viewer
- Open Graph and social metadata completeness

✅ Full Audit Scoring & Suggestions
- Live audit scoring for each analyzed section
- Highlight warnings, opportunities, and errors
- Simple color-coded icons: ✅ good, ⚠ warning, ❌ error
- Detailed explanations and helpful tooltips for every issue
- Embedded links to official documentation from:
- - Google Search Central
- - Web.dev
- - W3C
- - Schema.org
- - Mozilla MDN

✅ Modern Lighthouse-style Design
- Visually organized tabs:
- - Overview
- - Meta
- - Indexing
- - Headings
- - Images
- - Links
- - Accessibility
- - Tools

- Smooth navigation and drilldowns into specific issues
- Full sub-tab navigation for drilldowns on images and links

✅ Exportable & Shareable
Export full audit reports (coming soon)
Copy audit blocks directly for reports or clients

✅ SEO External Tools Integration
Quick links to:
- W3.org HTML Schema Validator
- Google Mobile-Friendly Test
- Google Rich Results Test
- Google PageSpeed Insights
- Prevue Open Graph Preview

✅ Privacy-First & Offline-First
- No servers involved
- Full analysis happens 100% locally in your browser
- No data sent externally
- No signup required
- Zero tracking
- Fully GDPR & CCPA friendly

✅ Zero Setup Required
- No configuration needed
- Works out-of-the-box on any webpage

✅ Who Is This For?
- SEO Specialists & Consultants
- Web Developers
- Digital Marketing Agencies
- E-commerce Managers
- SaaS Businesses
- Bloggers & Content Creators
- UX & Accessibility Auditors

🔥 Why SEO Analyzer is Different:
- 100% Instant Audit — one click, fully automatic
- No third-party servers — your data stays secure
- Professional-grade audit detail — designed for both experts & beginners
- Ultra-fast — analysis completed in under 1 second
- Google-compliant audits — based on official SEO guidelines
- Beautiful, clean, and highly readable UI

🔧 Technical Details:
- Chrome Manifest v3 Compliant
- Lightweight — minimal permissions required
- No background tracking
- Compatible with latest versions of Chrome, Brave, Edge, and Chromium-based browsers

🌎 SEO Analyzer Web App (also available)
Don’t want to install a Chrome extension?
- Use our fully standalone SEO Analyzer Web App — with the same full audit experience right in your browser without installation.

📈 Grow your SEO confidence.
-  Whether you're launching a new website, optimizing your existing pages, running an SEO audit for your clients, or troubleshooting complex SEO issues — SEO Analyzer is your perfect companion.

🔒 100% Privacy First. 100% Transparent.
- We do not store, track, or collect any of your data.
- All audits happen directly inside your browser.
- SEO Auditor is fully open-source. Anyone can review, audit, and contribute to the project. Source code is available at https://github.com/plainsignal/seo-auditor