So you want to know how to protect your website idea easily and before you get out there sharing it with everyone else?
The problem is, ideas on their own are not protected under traditional intellectual property laws like copyright, trademarks, patents and designs.
Your website idea is not protected by copyright unless it is put in to some format that can be handed around.
So if you have created a full outline for the website, mapped out how it will look and where different items of information will appear and possibly also covered off how people are likely to navigate through your site, you may have something that is able to be protected.
Source: How to Protect Your Website Idea