Canonical Tag Checker

Canonical tags are one of the most important — and most commonly misconfigured — parts of technical SEO. A wrong canonical can quietly tell Google to ignore the page you actually want to rank, or split ranking signals across duplicate URLs. This checker fetches any page and instantly shows its canonical tag, whether it points to itself (the best practice) or somewhere else, and whether there are any conflicting signals. Instead of just printing the raw tag like most tools, it gives you a clear, plain-English verdict: pass, warning, or fail, with an explanation of what each result means and how to fix it. That turns a confusing technical detail into an actionable audit you can act on immediately.

This tool goes deeper than a simple tag reader. It detects multiple conflicting canonicals — including the easy-to-miss case where an HTML tag and an HTTP Link header disagree — flags relative canonical URLs that should be absolute, and warns about the contradictory pairing of a canonical with a noindex directive. It also surfaces the page's meta robots setting and og:url so you can cross-check all your indexing signals in one place. Whether you are auditing a site migration, debugging why a page will not rank, or doing routine technical SEO, the canonical checker gives you a fast, reliable, and genuinely useful diagnosis. The check runs through a secure server endpoint that reads only the page head and stores nothing.