Many people are surprised when they find out that the URL is case sensitive (in contrast with the domain name). There is no difference how you write your domain name, meaning that DomainName.com = DOMAINNAME.COM = DOMAINname.com = domainname.com and so on. All the possible combinations are equal and will return the same result. The difference is huge when it comes to addresses like domainname.com/page and domainname.com/Page. This depends thought on the OS that you have installed on your server. Linux is Case Sensitive while Windows not.

Suppose you have decided to promote the version with a capital letter (domainname.com / Page).You think it looks better and its easier to remember.

So what is there to be done to solve these problems? Here are our solutions and recommendations that you can use in order to skip penalties:

# Most will recommend you to keep a single version. We recommend that you always stick with the lowercase version.

# If for some reason the address with capital letters have already been indexed by google or other search engines (someone put a link to your site or you have changed the CMS, and it made some changes), use 301 redirects to redirect users and search robots to the correct address.