Preview in pdf

Hi,

We have a requirement where users want to be able to preview a document/agreement in pdf before sending out the agreement in our application. The original format of the documents could be in html or MS Word.

Currently when they do preview in our own app, we use the API to create a transient doc, and then a library doc and then pull the pdf from the library doc. Is this the best way of doing this or there is a better way? Thx.