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library used for data compression.

zlib is a general purpose data compression library. All the code is thread safe.


The data format used by the zlib library is described by the following RFCs:

All functions of the compression library are documented in the file zlib.h. A usage example of the library is given in the file test/example.c which also tests that the library is working correctly. Another example is given in the file test/minigzip.c. The compression library itself is composed of all source files in the root directory.

To compile all files and run the test program, follow the instructions given at the top of Makefile.in. In short "./configure; make test", and if that goes well, "make install" works for GNU and BSD systems.


Download version 1.2.8 (stable)
released on 28 April 2013


Extensions, plug-ins, or add-ons for this program

pigzA parallel implementation of gziphttp://zlib.net/pigz/


LicenseVerified byVerified onNotes
ZlibGenium19 September 2013

Leaders and contributors

Gilles Vollant Contributor
Jean-loup Gailly Maintainer
Mark Adler Maintainer

Resources and communication

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Software prerequisites

This entry (in part or in whole) was last reviewed on 19 September 2013.


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Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the page “GNU Free Documentation License”.

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