SEO Tools PRO — Kiểm tra On-Page

Kiểm tra SEO on-page một cú nhấp: meta, Open Graph, schema.org, hreflang, liên kết, tốc độ, Core Web Vitals, độ dễ đọc, xuất báo…

SEO Tools PRO — Instant On-Page SEO Audit, Right In Your Browser. The fastest way to spot SEO issues, validate schema markup, and optimize any page you're viewing. One click gives you a full professional report — title, meta, Open Graph, Twitter Card, hreflang, schema.org, heading structure, image alt audit, internal/external link analysis, performance timing, robots.txt & sitemap.xml checks, keyword density, and a 100-point SEO score. Free. Unlimited. No login. Built for SEO specialists, content writers, web developers, and small-business owners who want clear answers without paying for a SaaS dashboard. ★ KEY FEATURES — ALL FREE, NO LIMITS ▸ 100-Point SEO Score A weighted score across 16 on-page factors with pass / warn / fail breakdown, animated gauge, and instant emotion feedback so you know exactly where to fix first. ▸ Full Meta & Social Preview Title, meta description, canonical, robots, hreflang — plus rich Facebook (Open Graph) and Twitter Card previews exactly the way your link will look when shared. ▸ Schema.org Markup Reader Parses every JSON-LD block — including deep @graph trees used by Yoast, RankMath, and Schema App. Each entity is listed with its @type, @id, and a direct link to schema.org. One-click jump to Google Rich Results Test and the Schema.org Validator. ▸ Heading Structure Audit Visual H1–H6 tree with color-coded levels, total count per heading, and warnings for missing or duplicate H1. ▸ Content & Readability Word count, sentence count, paragraph count, average reading time, and a Flesch readability score — so you know if the page is too thin or too dense. ▸ Keyword Density (1, 2, 3-gram) Top single words, bigrams, and trigrams with density percentage bars. Built-in Vietnamese + English stop-word filtering. ▸ Image Audit Detects missing alt text, missing width/height, lazy-loading status, and lists every image with a live thumbnail. ▸ Link Analyzer Internal / external / nofollow / sponsored / ugc / empty anchor / no anchor text — filter by category, jump straight to any link. ▸ Technical Health Check HTTPS, viewport, theme-color, favicon, manifest, AMP, HTML lang, charset, X-Robots-Tag, server, content-encoding, cache-control. Auto-probes /robots.txt and /sitemap.xml. ▸ Page Performance Real-time TTFB, FCP, DOMContentLoaded, total page load, transfer size, and the top 10 heaviest resources — using the browser's own Navigation & Resource Timing APIs. ▸ One-Click Export Save your audit as JSON, CSV, or a self-contained HTML report — or copy a clean summary to clipboard. Perfect for client deliverables and progress tracking. ▸ Dark Mode by default + Pro Dashboard UI 9 tab dashboard, animated SEO gauge, segmented controls, instant filtering, and a thoughtfully designed light/dark theme that respects your eyes. ★ WHO IT'S FOR • SEO specialists running quick on-page audits dozens of times per day • Agencies producing client-facing audit reports • Content writers checking meta, headings, and keyword balance before publish • Developers validating schema.org / JSON-LD output • Small-business owners who want a professional second opinion on their own site ★ PRIVACY SEO Tools PRO runs 100% locally in your browser. We do not collect, transmit, or store any personal data. No tracking, no analytics, no account. The extension only requests permissions strictly required to scan the active tab. ★ ABOUT Built and maintained by VLINK ASIA — a Vietnam-based digital marketing studio focused on practical, no-nonsense SEO. Feedback and feature requests welcome at https://www.vlink.asia/seo-tools/