There's a very good desktop application called Briss. It's used when a PDF has several pages per page and you need to split them into separate pages. Here is what it looks like:
As you can see, this program allows batch processing of all the pages in the document. That is a requirement. I don't want to have to individually crop each page.
I'm traveling at the moment and I only have my phone. Is there an Android app that can do the same thing? It does not have to be free.