Paste your page HTML and instantly check if your canonical tag is present, self-referencing, points to an unintended page, or is missing entirely. Canonical issues are a silent cause of reduced AI and search visibility.
Paste your page HTML on the left and click Check to analyze your canonical tag for issues that may reduce AI and search visibility.
What is a canonical tag and why does it matter for AI visibility?
A canonical tag (<link rel="canonical" href="...">) tells search engines and AI crawlers which version of a page is the "official" one. When you have duplicate or near-duplicate content on multiple URLs, a missing or incorrect canonical tag means AI crawlers may index the wrong version, split authority between duplicates, or skip your page entirely. Our GEO guide covers all the technical signals that influence AI visibility.
What does a self-referencing canonical mean?
A self-referencing canonical means the page's canonical tag points to itself (the current URL). This is considered best practice and signals to crawlers that this page is the definitive version. If your canonical points to a different URL, that means you are intentionally (or accidentally) telling crawlers to defer to that other page instead.
My page has no canonical tag. Is that a problem?
It depends on your site structure. If you have only one URL per piece of content and no URL parameters, a missing canonical is usually fine. But if your site generates multiple URLs for the same content (e.g. /page?ref=twitter, /page/ vs /page), missing canonical tags can cause duplicate content issues. Adding a self-referencing canonical is a safe, low-effort win. Pair it with a proper llms.txt and open robots.txt for full AI visibility coverage.