> ## Documentation Index > Fetch the complete documentation index at: https://docs.crane-it.com/llms.txt > Use this file to discover all available pages before exploring further. # Builder ## What is the builder ? The builder is our in-house tool to simplify and speed up the process of deploying a web application. If you're already a docker wizard, you probably won't need to interact with it. For the rest of us, it can save us a whole lot of time. ## Who does it work? First, you'll need to switch you project to the *Builder* mode, which can be done at the top of the project settings page. Once you've done so, you'll be met with an interface that looks something like this: builder As shown on the image above, you'll be met with the following options: * **Main container URL**: The main container is the one that will be exposed to the internet via http / https. * **Https**: Whether or not your project should be accessed via https. If you select it, we'll add a reverse proxy that automatically generates SSL certificates for you. * **Instance size**: Defines the ec2 instance type to use to deploy your project. Larger instances are more powerful, but cost more. * **Docker port**: Specify the port that your docker container exposes by default, so we can route traffic correctly. * **Containers**: The tool lets you customize all the containers you might need for your project. If you need help, you can read the docker compose documentation, or generate a project from our [Library](https://docs.crane-it.com/library/introduction), as all library templates are built using the Builder.