I was wondering if there are advertising industry standards on displaying website URLs in print ads? (for brick & mortar company having a website).

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Definitely not http://

If you omit (the redundant) www you can increase the text size of the URL in your ad.

I have seen some less tech-savvy folks not understand that www. is optional, and couldn’t find a URL in an advertisement.

So it depends on who you’re targeting – tech savvy or not. If you’re not sure, put in the www.

For a second opinion, check out: GoodURLBadURL.com