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. 🔒 PRIVACY FIRST 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 • Title width in pixels, the way Google measures it, next to the character count • Conflicting canonical tags, including canonicals sent in the HTTP Link header • Open Graph and Twitter Card validation with previews • Heading structure analysis (H1-H6 hierarchy) • Keyword density and readability scoring ⚡ PERFORMANCE • Core Web Vitals measured in your browser: LCP, CLS, INP, plus FCP and TTFB • The element behind LCP and the sources of layout shifts • Page weight, requests, DOM size and JavaScript size • HTTP status and the full redirect chain of the page 📊 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tools, CDNs and more • Over 7,000 technology signatures in the database • Version identification and warnings about outdated or insecure versions • Design system extraction: colors, fonts, spacing 📈 GOOGLE SERVICES • Detect analytics, tag management, ad services and other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 • Mixed content: http:// resources on https pages, split into blocked, auto-upgraded and insecure forms • Cookie security flags audit 🌐 SITE ESSENTIALS • robots.txt, sitemap.xml, security.txt, ads.txt, RSS/Atom feeds, favicon and web manifest • llms.txt detection and validation, plus the page's Markdown version for AI assistants (llms.txt v2) • AI crawlers: which bots can read the site, split into AI search, assistants and training, with Content-Signal and snippet limits 🗺️ SITEMAP ANALYZER • Fetches sitemap indexes and checks every URL: status, redirects, title, description, H1, canonical, noindex • Orphan pages: pages in the sitemap that no other page links to, with an inlinks count for each • CSV export, printable PDF report and a one-click AI audit prompt • llms.txt generator built from your sitemap 🌍 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 • Updates automatically when you move to another page • Free: no account, no subscription, no limits • Lightweight - small package, fast install • Dark and light theme support What's New in 2.8.0: • Title width in pixels: shown as information, a long title no longer lowers the score • Mixed content detection in the Security tab • HTTP status and redirect chain in the Overview • AI Bots rewritten: current bot list, split into search, assistant and training bots • Markdown version detection (llms.txt v2) • Sitemap Analyzer: orphan pages and inlinks count • Conflicting canonical tags flagged, canonical from the HTTP Link header read • Images from servers with strict CORP headers load everywhere in the panel • Smaller package (4.3 MB) and faster analysis • Removed: the internal linking graph from 2.7.15 (orphan pages are still detected)