DeepSEO – Free SEO Audit & On-Page Site Checker

Free on-page SEO audit & site crawler. Check titles, meta tags, headings, schema, broken links, Core Web Vitals & more.

DeepSEO is a free on-page SEO audit Chrome extension that crawls every internal page of your website and reports the SEO issues holding it back — all without sending a single byte to a third-party server. Run a complete site audit in minutes from your browser. Whether you're a freelance SEO, an in-house marketer, an agency consultant, or a developer shipping a new site, DeepSEO gives you the same depth of on-page analysis you'd expect from paid SaaS crawlers, free and private. ━━━━━━━━━━━━━━━━━━━━━ WHAT IT CHECKS (18+ categories) ━━━━━━━━━━━━━━━━━━━━━ • Title tags — length, uniqueness, missing/duplicate detection • Meta descriptions — length, uniqueness, missing tags • Heading structure — H1 presence, multiple H1s, hierarchy gaps • URL structure — depth, length, parameters, readability • Keyword optimization — density, prominence, on-page signals • Content quality — word count, thin content, readability hints • Internal linking — orphans, anchor text, deep-link distribution • Broken link checker — verifies every internal link with live HTTP checks • Images & media — missing alt text, oversized images, lazy-loading • Page speed signals & Core Web Vitals hints • Mobile friendliness — viewport tag, responsive checks • Structured data / Schema.org — JSON-LD, Microdata detection • Canonical tags — presence, conflicts, self-references • Duplicate content — title, meta, and body fingerprinting • Robots & indexability — robots.txt, meta robots, X-Robots, noindex • Outbound / external links — count, nofollow, target attributes • Open Graph & Twitter Cards — social sharing tag coverage • Breadcrumbs — schema and visible navigation breadcrumbs • Favicon, security headers, HTTPS, mixed content • & More ━━━━━━━━━━━━━━━━━━━━━ WHY DEEPSEO ━━━━━━━━━━━━━━━━━━━━━ ✓ 100% free, forever — no trial, no paywall, no account required ✓ 100% private — your audit data never leaves your browser ✓ Crawls the entire site, not just the active page ✓ Respects robots.txt and crawl-delay by default ✓ Discovers URLs from sitemap.xml automatically ✓ Runs in the background — close the popup, the audit keeps going ✓ Resumable across browser restarts ✓ Per-page scoring + site-wide score with severity-weighted issues ✓ Beautiful dashboard with charts, filters, and grouped issue views ✓ Export results to JSON or CSV for clients and reports ━━━━━━━━━━━━━━━━━━━━━ HOW IT WORKS ━━━━━━━━━━━━━━━━━━━━━ 1. Click the DeepSEO icon in your toolbar. 2. Confirm the site URL and configure crawl options (max pages, depth, concurrency, robots.txt, link verification). 3. Hit "Start audit" — DeepSEO crawls internal links breadth-first, fetching pages, parsing HTML, and running every analyzer. 4. Open the dashboard to view the score, issue breakdown by severity, per-page details, broken-link reports, and visual charts. 5. Export the report or share findings with your team. ━━━━━━━━━━━━━━━━━━━━━ PRIVACY ━━━━━━━━━━━━━━━━━━━━━ DeepSEO does not collect, transmit, sell, or share any data. There is no telemetry, no remote analytics, no account system. Audit results live exclusively in your browser's local storage. The only network requests the extension makes are to the website you choose to audit. ━━━━━━━━━━━━━━━━━━━━━ WHO IT'S FOR ━━━━━━━━━━━━━━━━━━━━━ • SEO consultants running quick audits for prospects • Agencies producing on-page SEO reports for clients • In-house marketers monitoring site health • Developers shipping new pages or migrations • Bloggers and small-business owners optimizing their own sites • Anyone learning technical SEO who wants visibility into what matters If you've been looking for a free SEO Chrome extension that actually crawls your whole site instead of just the page you're on, install DeepSEO and run your first audit in under a minute.