This it would have a longer post but this one is good enough. The link below is regarding a tool to create, modify, combine, compress and other, sometimes, necessary operations when working with PDF files.
When I found this link on May 29, 2016 it was free with reasonable limitations. It’s an on-line tool after all and is free as well…
Anyway, is perfect for my utility software list and you’re free to try it.
PDF Joiner @ http://pdfjoiner.com
or search it on-line…