PDF Split and Merge with Bookmark Import lets your merge multiple PDF files in single PDF file. You can use interface or command line for multiple PDF files.

PDF Split and Merge Install PDFSam's PDF Split and Merge software, then run it (link in Resources). Click the "Split" item in the pane that shows the "Plugins" folder.

Windows/Mac/Linux (All platforms): Join PDFs together, split them apart and pull out individual pages with pdfsam, an open-source, Java-based cross-platform tool that's a free download.

Softdiv PDF Split and Merge also allows you to split and break a large PDF file into multiple smaller parts. It supports multiple types of splitting methods (Split into single-page PDF file, Delete ...