SEO Checker

SEO Checker – Fast On-Page SEO Audit Analyze any webpage instantly with automated SEO checks directly inside your browser. Review technical SEO, content structure, metadata, links, images, and structured data, all in one simple popup. No setup required. Open any page and start auditing. --- WHAT SEO CHECKER CHECKS Meta and Indexing • Title tags and length • Meta descriptions • Canonical tags • Noindex and robots directives • Duplicate or conflicting tags • OG image presence Content and Headings • H1 presence and heading structure • Duplicate headings • Word count • Keyword density and placement • Keyword Density Checker — enter any keywords or phrases, see exact count and density %, and whether each one appears in the title, H1, and meta description • Optional on-page highlighter for checked keywords • Thin content signals • Hidden text detection • Copy heading hierarchy (H1 to H6) Technical SEO • HTTPS usage • Viewport and charset • HTML lang attribute • Favicon presence • URL structure issues • Mixed content warnings • DOM size and depth • Robots.txt check • Sitemap detection • llms.txt detection • Hreflang and international tags • Deprecated HTML usage • Iframes and page depth Performance • Render-blocking resources • Heavy JavaScript • Font loading issues • LCP hints Note: Built-in performance checks use browser timing data, not Core Web Vitals. For real Core Web Vitals use the PSI tab with a Google API key. Images • Missing alt text • Oversized and low resolution images • Responsive image usage • Lazy loading checks • Broken images • Image aspect ratio • LCP image detection • Image alt text visual highlighter to highlight missing alt images directly on the page Links • Internal and external links • Duplicate links • Empty anchor text • Nofollow usage • Broken link detection • Anchor text diversity • External link ratio • Visual link highlighter to highlight internal, external, and broken links on the page • Click any highlighted link to scroll and locate it instantly • Copy any link list as text in anchor: url format Structured Data • Schema markup detection • JSON-LD presence • Missing required fields • Empty schema values • Schema URL mismatch • Breadcrumb schema Social Tags • Open Graph tags • Twitter Cards • OG image dimensions and URL • OG URL vs canonical check • Social preview readiness --- HOW IT WORKS 1. Open any webpage 2. Click SEO Checker 3. Audit runs instantly with live scan progress 4. Review issues by category across Critical, Warnings, Info, and Passed 5. Use Visual Tools to highlight links and images on the page 6. Use Copy tools to export headings, meta tags, and link lists 7. Use the Keyword Density Checker to test target keywords against the live page --- PRIVACY Runs entirely in your browser. • No tracking • No data collection • No data selling • No ads --- PRO: SEARCH CONSOLE Connect Google Search Console to view live search data per page. • Clicks, impressions, CTR, average position • Period over period and year over year comparison • New, gaining, and dropping queries • Device breakdown across desktop, mobile, and tablet • Top countries sending traffic • Search appearance showing rich result types your page appears in • Image search performance • Index status via URL Inspection API • Robots.txt and page fetch state • Country level filtering • 6 date range presets from 7 days to 16 months • CTR opportunity detection • Copy queries as CSV • Multi-account support — connect more than one Google account and switch between them, with per-account enable/disable/remove • 90-day trend chart per metric (Clicks, Impressions, CTR, Position), each with its own color and line style, plus a combined "All" view with hover tooltips showing the exact value for any day --- OPTIONAL: PAGE SPEED INSIGHTS Connect Google's PageSpeed Insights API for deeper analysis using your own free Google API key. • Lighthouse Scores showing Performance, Accessibility, Best Practices, and SEO from 0 to 100 with analysis and fix guidance • Core Web Vitals showing real user LCP, INP, CLS, FCP, and TTFB from Chrome UX Report with Good, Needs Work, and Poor ratings • Lighthouse Issues showing specific failing audits grouped by SEO vs Performance with actionable fixes • Knowledge Graph checking if your brand or topic is in Google's Knowledge Graph • NLP Entity Analysis showing what Google understands your page is about using Google's own Natural Language API Each section runs independently so you trigger only what you need. PSI requires a free Google Cloud API key. PageSpeed Insights, Chrome UX Report, and Knowledge Graph APIs are completely free with no billing account needed. NLP Entity Analysis requires a billing account on your Google Cloud project with a free tier of 5,000 units per month. Billing disclaimer: SEO Checker uses your own Google API key. We have no access to your key, your Google Cloud project, or your billing account. Any charges from Google Cloud are solely between you and Google. We are not responsible for any charges incurred through your use of Google APIs. Always set a budget alert in Google Cloud Console to avoid unexpected charges. --- PERMISSIONS • Storage saves scan results and settings per tab • Active Tab analyzes the current page • Identity is optional Google login for Search Console --- CHANGELOG v1.9 • Added: Keyword Density Checker (Info → Content tab) — count, density %, and title/H1/meta-description presence for any keyword or phrase, with an optional non-destructive on-page highlighter • Redesigned: GSC panel toolbar — range, country, and accounts controls merged into a single compact row; removed verbose duplicate text cards in favor of stat tiles with period-over-period deltas • Added: proper multi-account support for Search Console — an Accounts panel listing every connected account with Connect/Remove controls, and a real Google account picker for adding new accounts