Auditing your website’s canonical link elements
The ability to cite canonical URLs can be a great asset for an SEO. Unfortunately it can also have negative impacts if used inappropriately. Between site migrations, the creation of new pages, switching to https, misuse or bugs in an SaaS, domain name switches and just the everyday grind of making changes that are due yesterday, it’s not that uncommon for an SEO or webmaster to use the canonical link element in a counterproductive fashion. Since it’s not visible and its effects are behind the scenes, incorrectly used canonicals can go unnoticed for years. Fortunately, finding bad canonicals can be rather simple.