Canonical URL – Fight Duplicate Content Errors


Written on February 13, 2009 – 3:51 pm | by NOTA Industries

There are many ways to improve SEO on any website, however, one of these methods is lost in the mix and is portrayed as a complex method to most, although it is one of the easiest errors to fix. It is the issue of the Canonical URL, which basically means, “which URL is the preferred URL?” Is it the ‘http://www.’ or the plain ‘http://’ (with no www.). Depending on how people link to your site, this could unintentionally cause you duplicate content issues, even though there is no duplicate content. You need to be proactive with this issue, and it is within your control.

The standard way to specify your canonical URL is through some simple HTML input into your source code (this came from Google’s blog):

<link rel=”canonical” href=”http://www.example.com/product.php?item=swedish-fish” />

inside the <head> section of the duplicate content URLs:

http://www.example.com/product.php?item=swedish-fish&category=gummy-candy

http://www.example.com/product.php?item=swedish-fish&trackingid=1234&sessionid=5678

and Google will understand that the duplicates all refer to the canonical URL: http://www.example.com/product.php?item=swedish-fish. Additional URL properties, like PageRank and related signals, are transferred as well.

If you are running WordPress, there is a plugin that was developed to help with Canonical URL’s. It will do all of the legwork for you.

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  1. 33 Responses to “Canonical URL – Fight Duplicate Content Errors”

  2. By 5ubliminal on Mar 26, 2009 | Reply

    Try this plugin: Canonical URL WordPress Plugin.

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    I use this method for my dupe content prevention. thanks again

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    I bookmarked this page . Thank you for given this useful post….

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    I found your post really interesting. I found Internet marketing a really a great way of promoting a website. I found good results when I started internet marketing my website.

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    Great post! My friend runs a small business we do internet marketing for companies and so a lot of our e-newsletter, blog and seminar content revolve around for promotion. Thanks!!!

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    Great work! What is discuss here is one side of the coin, what about social media, isnt it a challenge to google

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