Of the three, only has any usage guidance or tag wiki. The other two ( and ) are bare. Glancing over the questions in each tag, there does not appear to be any meaningful distinction in usage. Should these tags be merged?

  • 3
    So you're asking which is the canonical canonical tag? Jan 6, 2017 at 10:57
  • 1
    How very meta, and very Meta.
    – choster
    Jan 6, 2017 at 19:43

1 Answer 1


is a specific type of canonical implementation. It uses a meta tag. The other implementation for canonical URLs is 301 redirects. I'd keep separate from the others. I have written a tag wiki for rel-canonical.

and are probably similar enough to merge on this site. There could be canonical things other than URLs, but I'd expect that 99.9% of the usage of refers to URLs. Because of that, I would prefer to be the canonical of the two.

EDIT: The proposed merge of "canonical" and "canonical-url" has now been completed:


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