QPDF, tool for structural, content-preserving transformations on PDF files

QPDF is on SourceForge and github:

QPDF downloads on SourceForge

QPDF repository on github

Excerpts:

[ QPDF is a command-line program that does structural, content-preserving transformations on PDF files.
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QPDF is capable of creating linearized (also known as web-optimized) files and encrypted files. It is also capable of converting PDF files with object streams (also known as compressed objects) to files with no compressed objects or to generate object streams from files that don't have them (or even those that already do). QPDF also supports a special mode designed to allow you to edit the content of PDF files in a text editor.
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QPDF includes support for merging and splitting PDFs through the ability to copy objects from one PDF file into another and to manipulate the list of pages in a PDF file. The QPDF library also makes it possible for you to create PDF files from scratch. In this mode, you are responsible for supplying all the contents of the file, while the QPDF library takes care off all the syntactical representation of the objects, creation of cross references tables and, if you use them, object streams, encryption, linearization, and other syntactic details.
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QPDF is not a PDF content creation library, a PDF viewer, or a program capable of converting PDF into other formats. ]

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