Free online Canonical Tag Checker that inspects any web page's <link rel="canonical"> tag in real time. Enter a URL and instantly see whether a canonical exists, if it's absolute or relative, whether it's self-referencing, and whether there are duplicate canonical tags. Powered by a live HTML fetch through a public CORS proxy chain (with optional self-hosted PHP proxy for reliability). Get actionable SEO checks with OK/FAIL indicators, plus copy and download report options. No fake data — ever.

Features

Live Canonical Detection — Fetches the actual page HTML and finds every <link rel="canonical"> tag, not just the first one.
Deep SEO Checks — Validates absolute vs relative URL, self-reference, duplicate canonicals, and invalid hrefs with clear OK/FAIL indicators.
Multi-Proxy Fallback — Uses a chain of CORS proxies (local PHP → allorigins → codetabs → corsproxy) so the tool works on any hosting.
Copy & Download Report — One-click copy of the result or download the full check report as Forex-canonical-tag-checker.txt.
100% Private & Client-Side — Only the HTML <head> is parsed in your browser; nothing is stored or uploaded to any server.

Features

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