What is canonical tag?

A canonical tag (“rel canonical”) is a snippet of HTML code that defines the main version for duplicate, near-duplicate and similar pages.

Canonical tag instructs search engine which version of a URL it must use to index and rank in search results.

It is the URL that you want to appear in Google’s search results.

What does a canonical tag look like?

A canonical tag is represented as rel=”canonical’ in HTML

Canonical tags are specified in the source code.

View page source

You can look at

Code Example

<link rel="canonical" href="https://www.webseomaking.com/learn/seo/" />

Canonical tag code example

Alternatively you can include them in the HTTP headers.
Link: <https://www.webseomaking.com/learn/seo/>; rel=”canonical”

Also, avoid creating chains of canonical tags, that is, one URL being canonical to another URL, while it itself has a canonical URL for it.

There are a ton of different ways to render homepages, there’s:

  • http://www.webseomaking..com
  • https://www.webseomaking.com
  • https://webseomaking.com
  • https://webseomaking.com
  • https://webseomaking.com/index.php
  • https://webseomaking.com/index.html
  • https://webseomaking.com/amp

1-Get rid of duplicate content within your own site
2-All your get link to one place
3-Deal with the protocol issues (Http/Https)

Some sites use the secure HTTPS protocol (e-commerce sites, for example). However, there may be an HTTP version of the same page indexed. In this case, using the canonical tag will help.

Why does canonicalization for SEO?

Search engines don’t know which version of URL to rank in result pages.

In order for canonical tags to work properly, they must be used correctly and consistently.

Duplicate content is the problem that arises when search engines find several copies of the same content, which creates a problem when they try to rank-order them.

Google does not want to rank the same thing in search so it will only rank one version of a page.

If you are creating multiple duplicate pages it’s good to have canonical tags.

Duplicate content can thus be avoided, even with the same content on different URLs.

This is valuable with regards to the quality and accessibility of all website content.

Integrating SEO in web sites is one of the most challenging parts of running an online store.