Missing Canonical Tag for a PDF document

[ahmadmdahshan]

Error: Missing Canonical Tag
But URL is not a webpage it is a PDF document, is this fixable?

[equipmentmanual]

@Adnan-farooq said in Missing Canonical Tag for a PDF document:

i don't think that we used canonical tag for PDF document i think no option is visible on moz

Hitachi Workshop Manual Instant Download PDF at your fingertips. Access valuable resources for quick and efficient equipment maintenance and operation. Don't miss out on this essential source for Hitachi machinery enthusiasts.

[equipmentmanual]

Hitachi Workshop Manual Instant Download PDF at your fingertips. Access valuable resources for quick and efficient equipment maintenance and operation. Don't miss out on this essential source for Hitachi machinery enthusiasts.

[Adnan-farooq]

i don't think that we used canonical tag for PDF document i think no option is visible on moz

[Tom.Capper]

@ahmadmdahshan

There's two answers to this.

One is that whilst it's best practice for all URLs to have a canonical (even if it's self-referencing), if this resource has no duplicates, it's not mandatory.

The other is that yes, you can add a canonical tag to a web page. You'd have to do it at the HTTP header level.

https://developers.google.com/search/docs/crawling-indexing/consolidate-duplicate-urls#rel-canonical-header-method