BBCode Converter is an add-on for Google Docs that allows the conversion of styled content in Docs document to be converted to well-formed BBCode.

BCode is a lightweight markup language, not too dissimilar to other XML-like languages like HTML. It is often used in forum software or message boards to allow users to create content without needing to know a more complicated markup language like HTML. 
This addon allows you to write and format your documents within a Google Docs document as you like and then convert the document text into valid BBCode, right from within the document.


Features:
• One-click conversion
• Currently supports the conversion of the following formatting options:
   - Bold text
   - Italic text
   - Strikethrough text
   - Underlined text
   - Colored text
   - Links inside text
   - Lists
   - Paragraphs
   - Superscript
   - Subscript
• Lightweight and easy to use.
• More to come...

Please note:
If you get the the error message "Script error: Authorization is required to perform that action" or a similar error message:
Please check if you are currently logged in with multiple Google accounts. This seems to be a known problem when working with multiple accounts at the same time. Logging out of your other accounts usually works.
Alternatively you can try to reinstall the addon.