Thanks to this PDF merger you can easily merge combine files.

On the top of that this Merge PDF files is really fast free lightweight and stable. The application is also straightforward and easy to use.

List of features:
- combine PDF files
- choose your own filename
- pick a directory where you want to save the merged file

To start you only need to choose your filename and the files that you want to merge.

Warning this application will not work on files protected by password or malformed files.

The application is open-source it is covered by the AGPL license.

The source code can be found here:

https://github.com/kal27/merge_pdf_files