How to merge files using PDF Reader Pro for Mac?

  There are Three basic ways you might want to use the Merge feature: either merge pages or merge entire PDF files.

Option 1:

1. Click Tools on the main menu -> Editor -> Merge;

2. Add Files you want to combine;

3. Set the page range and page size as you desire.

 Option 2:

1. On the main menu, click File -> Merge PDF Files;

2. Select the PDF file(s) you want to add to the existing one and press Open;

Option 3: 

1. Select Editor on the toolbar -> Merge  -> Add Files;

2. Add one or more PDF files to merge in batch. 

3. Set the page range and page size as you desired.