Do You Make This Domain Name Mistake?

Blogging Tip No. 6: use a canonical domain name!

In basic english, what this tip means is either use or as your definitive domain name (“canonical” is a fancy word for “definitive”).

To do this, log into Google webmaster tools and set it to either of or – so that Google knows the preferred way of writing your address.

Here’s some information from the Webmaster Help Center on how to go about this.

The other thing you should do is create a 301 http redirect in .htaccess from the non-www version to the www version (or vice versa depending on your preference); e.g. try clicking or

Here’s the word of Google search engineer, Matt Cutts, on the topic of canonicalisation:

Canonicalization is the process of picking the best url when there are several choices, and it usually refers to home pages. For example, most people would consider these the same urls:


But technically all of these urls are different. A web server could return completely different content for all the urls above. When Google “canonicalizes” a url, we try to pick the url that seems like the best representative from that set.

Q: So how do I make sure that Google picks the url that I want?
A: One thing that helps is to pick the url that you want and use that url consistently across your entire site. For example, don’t make half of your links go to and the other half go to . Instead, pick the url you prefer and always use that format for your internal links.

About Alastair McDermott

Alastair McDermott is an online business and technology consultant specialising in helping B2B and professional services businesses to sell more online.

With a background in software, web design & development, internet marketing and search engine optimisation, he has been building websites and software since 1996 and is a ten year veteran of using WordPress.

He has co-founded several software, web and information based startup companies and has provided solutions for many large Irish and international organisations.

Alastair blogs, and makes media of all kinds at WebsiteDoctor. Follow him on Twitter at @WebsiteDoctor or .


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