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QPDF is a free command-line program that can convert one PDF file to another equivalent PDF file. It is capable of performing a variety of transformations such as linearization (also known as web optimization or fast web viewing), encryption, and decryption of PDF files. It also has many options for inspecting or checking PDF files, some of which are useful primarily to PDF developers. 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.

QPDF
Original author(s) Jay Berkenbilt
Initial release April 26, 2008 (2008-04-26)
Stable release
7.0.0 / September 15, 2017; 54 days ago (2017-09-15)
Development status Active
Written in C++
Operating system Multiplatform
Type PDF software
License Apache License Version 2.0
Website qpdf.sourceforge.net

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 of the syntactical representation of the objects, creation of cross references tables and, optionally, object streams, encryption, linearization, and other syntactic details.

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