First, it's free, and doesn't even have any ads cluttering everything up. Second, it works entirely offline, meaning you're not uploading your PDF files to the internet in order to use it.

Another app that you can download to your PC and use offline is PDFill. This PDF editor works with most Windows versions, such as Windows 7, 8, and 10, and doesn’t support Mac and Linux.

First, it's free, and doesn't even have any ads cluttering everything up. Second, it works entirely offline, meaning you're not uploading your PDF files to the internet in order to use it.