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 2.7.11: • CLS text snippets fixed — Layout shift source previews • Code cleanup — Removed duplicate code across modules, reducing codebase duplication to under 1% • 30% smaller extension What's New in 2.7.10: • Core Web Vitals Attribution — Click any LCP, CLS, or INP metric to see exactly what's causing the issue: element selectors, shift sources, interaction breakdowns, and slow scripts (via Long Animation Frames API) • Page Stats Details — Click Weight, Requests, DOM, JS Size, TTFB, or FCP cards to reveal detailed breakdowns: largest resources, request types, DOM structure, render-blocking resources, and more • Copy to Clipboard — All detail panels now include a copy button for quick data export • Smarter AI Audit Prompts — "Comprehensive SEO Audit" now includes Web Vitals data and performance stats with specific elements, selectors, and file sizes for more precise recommendations • Sitemap Analyzer — Preview in new tab, comparison view (diff what changed), context menu integration, and cached data management • Bug fixes — CLS column alignment, copy button reliability, sitemap domain switching