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 • Page title and description, with the title's width in pixels measured the way Google displays it • Canonical and indexing directives, including conflicts between the page and its HTTP headers • Social sharing previews as they appear on Facebook and X • Heading hierarchy and keyword density ⚡ PERFORMANCE • Core Web Vitals measured in your browser, with the element behind the slowest paint and the causes of layout shifts • Page weight, number of requests and DOM size • HTTP status and the full redirect chain 📊 STRUCTURED DATA • Schema.org markup detection and validation • Rich Results eligibility and suggestions based on the page type 🔗 LINKS • Internal and external links with their rel attributes • Empty and broken links 🖼️ IMAGES & MEDIA • Missing alt text, dimensions and file size • Lazy loading, modern formats and oversized images 🛠️ TECHNOLOGY DETECTION • Recognises over 7,000 technologies a page is built with, including their versions • Warns about outdated or insecure versions • Extracts the page's design system: colours and typography 📈 GOOGLE SERVICES • Detects Google integrations and monitors the events they send • Consent Mode v2 validation and a data layer inspector 🍪 TRACKERS & COOKIES • Identifies cookies against a database of 2,200+ known ones and groups them by purpose • Browser storage analysis and tracking pixel detection ♿ ACCESSIBILITY • Automated WCAG 2.2 checks, including colour contrast • Fix suggestions ready to paste into an AI assistant 🔐 SECURITY • HTTPS and security headers • Insecure resources loaded on secure pages • Cookie security flags 🌐 SITE ESSENTIALS • Checks the standard files a site publishes for search engines, feeds and security contacts, and reports what is missing • Detects and validates llms.txt, with a generator to create one • Shows which AI crawlers may read the site, for search, assistants and model training 🗺️ WHOLE-SITE CRAWL • Audits every page listed in your sitemap and flags status, redirect and indexing problems • Finds orphan pages that no other page links to • Exports the results and builds a ready-made audit prompt 🌍 INTERNATIONALIZATION • Hreflang and language declaration checks 📤 EXPORT • Reports in several formats, including a PDF with an overall score ✨ WHY UPER? • Works in the side panel, next to the page you audit • Updates automatically when you move to another page • Free: no account, no subscription, no limits • Small package, dark and light theme What's New in 2.8.2: • A canonical that points to the clean address (tracking or filter parameters dropped) is now shown as correct instead of "different page" • Paginated pages that point to page 1 still get a warning, as Google recommends they reference themselves What's New in 2.8.1: • Fixed: valid dates with fractional seconds are no longer flagged as invalid