Split and merge PDF files with PDFsam, an easy-to-use desktop tool with graphical, command line and web interface.
Features
- Merge PDF files together
- Split PDF files specifying the page number
- Split PDF files specifying the level of bookmarks
- Split a PDF in files of the given size
- Rotate PDF files
- Mix two PDF files taking pages alternately
- Extract pages from PDF files


Download:https://sourceforge.net/projects/pdfsam/files/latest/download
Source code:https://sourceforge.net/p/pdfsam/code/HEAD/tree/