Uper SEO Auditor

All-in-one SEO auditor in your sidebar — meta tags, schema, links, images, 7K+ technologies and more. 100% local, no account needed.

Uper SEO Auditor gives you a full on-page SEO audit directly in your browser's side panel — no tab switching, no external tools, no account needed. All analysis runs locally in your browser. 🔒 100% PRIVACY All data stays in your browser. No external servers, no tracking, no login required. Your data is yours. 🔍 WHAT YOU CAN ANALYZE META & CONTENT • Title, description, canonical URL, robots directives • Open Graph and Twitter Card validation with previews • Heading structure analysis (H1-H6 hierarchy) • Keyword density and readability scoring 📊 STRUCTURED DATA • JSON-LD schema detection and validation • Rich Results compatibility checking • Smart schema recommendations based on page type 🔗 LINKS • Internal and external link breakdown • Nofollow, sponsored, UGC attribute detection • Empty and broken link detection 🖼️ IMAGES & MEDIA • Alt text audit, dimensions, file size • Lazy loading and modern format detection • Oversized image warnings • CSS background-image analysis 🛠️ TECHNOLOGY DETECTION • Identify CMS, frameworks, libraries, analytics tools, CDNs and more • Over 7,000 technology signatures in the database • Version identification where available • Design system extraction — colors, fonts, spacing 📈 GOOGLE SERVICES • Detect analytics, tag management, ad services and other integrations • Event monitoring and categorization • Consent Mode v2 validation • DataLayer inspector 🍪 TRACKERS & COOKIES • Cookie identification against a database of 2,200+ known cookies • Privacy categorization and consent management detection • Storage analysis — localStorage, sessionStorage, IndexedDB • Tracking pixel and beacon detection ♿ ACCESSIBILITY • Automated WCAG 2.2 checks across 9 categories • Contrast ratio checking with font-size awareness • AI-powered fix suggestions you can paste into any AI assistant 🔐 SECURITY • HTTPS validation and security headers analysis • Cookie security flags audit 🌐 SITE ESSENTIALS • Check for robots.txt, sitemap.xml, security.txt, llms.txt, ads.txt • AI crawler access rules overview • Favicon and web manifest detection • Sitemap analyzer with CSV export 🌍 INTERNATIONALIZATION • Hreflang tag validation • Language declaration checking 📤 EXPORT • Export reports to JSON, CSV, or PDF • Comprehensive PDF reports with SEO score ✨ WHY UPER? • Side panel — audit pages without leaving them • Fast — instant analysis on page load • Private — everything runs locally, zero data sent anywhere • Free — no account, no subscription, no limits • Lightweight — small package, fast install • Dark and light theme support What's New in 2.7.12: • Sitemap AI Audit Prompt — One-click AI prompt with full sitemap audit: status breakdown, duplicates, content stats, and prioritized fix recommendations • Sitemap Extended Metadata — Extracts lastmod, priority, changefreq, images, videos, and hreflang from sitemaps with new CSV export columns • Sitemap Redirect Detection — Detects 301/302 redirects during analysis with final URL tracking • Sitemap Tabbed Preview — Audit preview split into Overview, Changes, and External Links tabs with bar charts, domain/URL tables, and CSV export• Sitemap PDF & Print — Save or print the full sitemap audit report directly from the preview page • Sitemap Filter Sorting — Filtered results now sort by relevant field (duplicates grouped together, length issues by severity) • Sitemap Large Cache Fix — Sites with 4,000+ URLs no longer fail to cache silently • A11y HTML Context — AI fix suggestions now include parent HTML structure for easier issue location • A11y Accuracy — Fixed text-resize false positives and filtered out third-party widgets (cookie banners, chat widgets) • Canonical Hash Fix — No more false warnings when page URL contains a hash fragment • Page Stats — Full URLs displayed with CSS truncation instead of cut-off filenames What's New in 2.7.11: • CLS text snippets fixed — Layout shift source previews • Code cleanup — Removed duplicate code across modules, reducing codebase duplication to under 1% • 30% smaller extension