Backlink URL: With or Without WWW?

[Japracool]

When it comes to backlinks. Does it matter with or without WWW?

For example my website is without WWW and I backlink with WWW, will it still affect my website rank?

[DeanAndrews]

I believe it does matter. You should choose with or without the www and stick with it (however your site is currently formatted).

Technically speaking with www is a different URL that the one without www so you link building efforts would be split across two domain which would not be cool.

[BenjaminEvans]

I agree with Dean. You should stick with the format being used on your main site. Also, be sure to go into webmaster tools and verify both the www and non www versions of your site, then select the preferred version of your site as non www. I think you might have some link juice loss as well due to redirect of www to non www. So just link to what your main site uses and you will be good to go.

[irvingw]

"Technically speaking with www is a different URL that the one without www so you link building efforts would be split across two domain which would not be cool."

The non www should 301 to the www version, so it's not two sites, it's one. If it's two separate sites indexed that needs to be fixed asap.

But if you are www then your links should be www as well so that no page juice is lost because of the redirection.

[DeanAndrews]

With respect that was not the question being asked re 301. If you have are embarking on building link then sticking with one format would be best surely?