Anyways to convert appian documents to base64 format?

If you need to send that doc in an integration, then you can directly pass that doc and it will auto convert it. 

Did you come up with a solution for this?  I am trying to get the base64 of a document without using the base64 to DB option and this is not for an integration use case.

Can you like try this I am not sure if it work successfully , but if you can get the text from the document (readtextfromfile: please look for this plugin  community.appian.com/.../read-data-from-a-text-file) , and create a stored procedure which convert the text into base 64 (output ). Send the text into Stored procedure and get base 64 (database.guide/.../)

Plaintext can be converted to Base64 encoding in Appian using OOTB functions in an expression rule (i know, since I wrote one).  The problem is, this is quite a bit different from getting the base64 conversion of a file - which there's no assumption will be a plaintext ".txt" file, for instance.

There used to be functionality built-in to Appian which allowed back-and-forth conversion, but a few years ago it was "disappeared".  Now I think the only remaining way to handle this (if any), *might* be to set up some sort of in-environment API call, but if so, I don't know how to do it.

Thanks for the response.  I thought I remembered that functionality too.

My current thought is to use the 'Base64 to Database Services' plug-in to write the value to a DB, then immediately query it back into the process for use in an HTML doc I'm trying to create.  It's a little messy, but the images I'm converting are <1KB, and is pretty efficient in my testing thus far.