SEO Analyzer

About

EO Analyzer gives you a complete, instant SEO audit of any web page — directly in your browser. No account, no external service, no data sent anywhere. 100% local and private.

🔍 WHAT IT DOES
Click the icon or open the side panel to get a detailed SEO report covering 45+ checks across 6 categories:

✅ On-Page SEO (25% weight)
• Title tag presence and optimal length (50-60 characters)
• Meta description presence and length (150-160 characters)
• H1 tag count and heading hierarchy (H1→H2→H3)
• Image alt attributes
• Clean URL structure
• HTML lang attribute
• Internal linking

✅ Technical SEO (20% weight)
• HTTPS detection
• Viewport meta tag
• Robots meta (noindex check)
• Canonical URL validation (self-referencing)
• Structured data (JSON-LD) detection
• Favicon presence
• Hreflang tags for multilingual sites
• Resource count optimization

✅ Content Analysis (20% weight)
• Word count (300+ recommended)
• Flesch readability score
• Keyword density and stuffing detection
• Text-to-HTML ratio
• Paragraph and sentence length

✅ Social & Meta (10% weight)
• Open Graph tags (og:title, og:description, og:image, og:type, og:url)
• Twitter Card tags
• Live social media preview card

✅ Links Analysis (15% weight)
• Internal and external link detection
• Broken link identification (javascript:void, empty #)
• Nofollow ratio analysis
• Anchor text quality
• Outbound domain diversity

✅ Accessibility (10% weight)
• Semantic HTML (<main>, <article>, <nav>)
• Form label coverage
• ARIA landmarks
• Skip navigation link
• Image alt attribute handling (informative vs decorative)

📊 FEATURES
• Overall score with weighted calculation (0-100)
• Color-coded results: green (80+), orange (50-79), red (<50)
• Expandable check cards with descriptions and recommendations
• Side panel for full detailed report
• Popup for quick score overview
• Export as plain text or JSON
• Content statistics: word count, Flesch score, top keywords with density
• Social media preview card (Facebook/Twitter)
• Links summary with outbound domains list

🌐 BILINGUAL
• Full French and English interface
• Automatically adapts to your browser language

🔒 PRIVACY-FIRST
• Zero data collection — everything runs locally
• No external API calls
• No analytics or tracking
• No ads
• Open source

⚡ HOW TO USE
1. Navigate to any web page
2. Click the SEO Analyzer icon for a quick score
3. Click "Full report" to open the side panel
4. Review checks, fix issues, re-analyze

Perfect for SEO professionals, web developers, content creators, digital marketers, and anyone who wants to improve their website's search engine visibility.