# GitBook Format Documentation

> This documentation is for GitBook version **{{ book.version }}**

GitBook is a command line tool (and Node.js library) for building beautiful books using GitHub/Git and Markdown (or AsciiDoc). Here is an example: [Learn Javascript](https://www.gitbook.com/book/GitBookIO/javascript). This documentation has been generated using GitBook.

GitBook can output your content as a website ([customizable](themes/README.md) and [extensibles](plugins/README.md)) or as an ebook (PDF, ePub or Mobi).

[GitBook.com](https://www.gitbook.com) is the online platform to create and host books built using the GitBook format. It offers hosting, collaboration features and an [easy-to-use editor](https://www.gitbook.com/editor).

### Help and Support

We're always happy to help out with your books or any other questions you might have. You can ask a question on the following contact form at [gitbook.com/contact](https://www.gitbook.com/contact) or signal an issue on [GitHub](https://github.com/GitbookIO/gitbook).

### FAQ

Some questions are frequently asked. If you have a problem you should  [check this out](faq.md) first.

### Contribute to this documentation

You can contribute to improve this documentation on [GitHub](https://github.com/GitbookIO/gitbook) by signaling issues or proposing changes.