The OS X function that allows all of this is the Print function found in most applications. Print has a special item on the PDF button called Save PDF to iPhoto. This will convert whatever you are printing into a PDF file and send it directly to iPhoto. You will organize your documents in iPhoto for syncing using this method. Here are the instructions to do this:
- Open the file you want to view on your iPhone in its native app in OS X.
- Select Print. In the dialog that appears select the PDF button on the bottom left hand side.
- Now scroll down the pop-up list and select Save PDF to iPhoto.
- iPhoto will launch, and you will be prompted for an album name to store the new files. Type in the name of the document, or if you prefer just "iPhone Documents" if you'd like to make this album the repository of all your converted documents.
- Sync your iPhone. You'll have to go to the Photo page in iTunes to make sure the folder is selected and that the images sync.
- On your iPhone, click Photos and you'll see the PDF has been broken down by pages and is viewable, scrollable, and zoomable like any other photo.

