Document conversions are consider transformations within the Filestack tool and for most of our transformations you can get additional information in this article: http://kb.filestack.com/filestack-general/transformations or on our transformations page here: https://www.filestack.com/features/image-transformations, however document conversions are a little different.
All of our plans include document conversions, https://www.filestack.com/docs/document-transformations, however as anyone who has attempted to convert a complex DOCX or PPTX to PDF knows there are a lot of challenges maintaining formats and fonts correctly. We have a powerful engine behind our pretty facade that allows us to do this seamlessly. Convert those large, graphics heavy presentations or use those fancy fonts and still get it into a PDF with our Advanced Document Conversions. For additional information on adding this functionality to your account please reach out to us either in chat or at firstname.lastname@example.org. We are happy to help!