# GitBook Toolchain Documentation This document aims to be a comprehensive guide to the GitBook command line tool, version **3.2.3**. This is the same toolchain used by the legacy GitBook platform, living at legacy.gitbook.com. Help for using the platform can be found at [help.legacy.gitbook.com](https://help.legacy.gitbook.com). If you are looking for the new GitBook service, head to [gitbook.com](https://www.gitbook.com). ### What is `gitbook`? `gitbook` is a command line tool (and Node.js library) for building beautiful books using GitHub/Git and Markdown (or AsciiDoc). 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). [legacy.gitbook.com](https://legacy.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://legacy.gitbook.com/editor). ### Help and Support If you have problems with the toolchain, you can search for or open a discussion on [GitHub](https://github.com/GitbookIO/gitbook). Check out the [GitBook Community Slack Channel](https://slack.gitbook.com) for help, and stay updated by following [@GitBookIO](https://twitter.com/GitBookIO) on Twitter or [GitBook](https://www.facebook.com/gitbookcom) on Facebook. ### 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.