PDF Split/Merge is a stand-alone tool for splitting, merging PDF documents, it allows you to split large PDF files into smaller PDF files.
PDF Split/Merge is offered as an easy-to-use GUI (Graphical User Interface) application, and command-line application.
    The split functionality lets you split one or more PDF files based on page groups, page ranges. The merge functionality lets you quickly combine a collection of PDF documents and page sets.

Features

• Adobe Acrobat and Reader NOT required! 
• Automates the process of splitting and merging multiple PDF files
• Rearrange pages in a document
• Split PDF documents by page numbers or custom page ranges etc
• Split a file into single pages or sets of pages(page ranges, odd/even pages...)
• Merging one or more PDF files
• Many different split and merge methods
• Supports Command Line and batch processing
• Supports pdf v1.6(Acrobat 7.0)
• Drag and Drop support of files
• List order organizing
• Save, Load & Append Batch Lists
• Modify document information data such as Author, Subject, Title or Keywords to all generated documents.
• Supports encrypted pdf files.