Relative canonical URL

Warning severity, in the Canonicals tab

Why it matters

Relative canonicals are error-prone and can point to the wrong host or protocol.

How to fix it

Use absolute URLs in canonical tags.

How Crawlune finds it

Crawlune flags Relative canonical URL automatically on every crawl and lists the affected URLs under the Canonicals tab, where you can filter, inspect each page and export the list to CSV. The free version crawls up to 550 URLs with every check enabled.