SeedDMS is for storing documents like any other document management system (DMS). Converting documents into other formats may seem like some extra requirement not really needed. But, to make real use of a DMS, converting documents is inevitably. The most obvious use is the creation of preview images. User expect those images for each document, because they make it much easier to scan quickly through a list of documents, identifying the one searching for.
Storing documents in a Document Management System like SeedDMS helps in organizing your scanned paper work, digital media, or any other electronic resources you would like to keep at a central place and possibly share with other people. When setting up such a system you will have to define some schema how to organize the documents. Since SeedDMS offers folders just like a regular file system, this is quite often the preffered way, taking into consideration, that users are well acquainted to such a hierachical folder structure.