A free app for Android, by keytools inc.

Do you ever find yourself with multiple pdf documents that contain similar data? If yes, then this app is definitely for you. The app will allow you to scan multiple pdf files and combine them into one single pdf file. You don’t need to worry about the security of the data, as the app will make sure that the data is not accessed by any other person.

It’s a lightweight application, which does not need any special permissions. You don’t need to install anything else but this app, to make the process of merging pdf files simple, effective, and quick.