Merging and splitting PDF files

If you want to merge multiple PDF files or split a PDF file, an excellent free tool avalable is PDF Split and Merge. It can do more that just split and merge PDF files.

It can be downloaded from the following URL:
http://www.pdfsam.org/

It has a simple and intuitive interface, with which you can:

• split your pdf documents (into chapters, single pages, etc.)
• merge many pdf documents or subsections of them
• extract sections of your document into a single pdf document
• mix alternate pages taken from two pdf documents in straight or reverse order into a single document
• rotate pages of the selected pdf documents
• visually reorder pages of a selected pdf document
• visually compose a document dragging pages from selected pdf documents
• save and load your environment to automatize your recurrent jobs
• manage pdfsam settings and set an environment to load at start up

There is also an enhanced version of this tool, which has all the basic features plus:

• encrypt your pdf files (RC40 bits, RC128 bits, AES128 bits) and set permissions on them
• add a pdf frontpage or an addendum (or both) to your pdf documents
• decrypt pdf documents
• extract attachments from your pdf documents
• set viewer options to a document to tell the viewer application how should open the document
• set the metadata of a document (author, title, subject and keywords)

The features available and a comparison between the basic and enhanced version cna be found in the following link:
http://www.pdfsam.org/?page_id=42