Plzip is a massively parallel (multi-threaded), lossless data compressor
based on the lzlib compression library, with a user interface similar to
the one of lzip, bzip2 or gzip.
Plzip can compress/decompress large files on multiprocessor machines
much faster than lzip, at the cost of a slightly reduced compression
ratio. Note that the number of usable threads is limited by file size,
so on files larger than a few GB plzip can use hundreds of processors,
but on files of only a few MB plzip is no faster than lzip.
In this plzip benchmark page you can find
some tests showing the performance of plzip on a multiprocessor machine.
Plzip uses the lzip file format; the files produced by plzip are fully
compatible with lzip-1.4 or newer.
The lzip file format is designed for long-term data archiving. It is
clean, provides very safe 4 factor integrity checking, and is backed by
the recovery capabilities of lziprecover.
Plzip uses the same well-defined exit status values used by lzip and
bzip2, which makes it safer than compressors returning ambiguous warning
values (like gzip) when it is used as a back end for tar or zutils.
Learn more about lzip in the Lzip Home Page.
The manual is available in the info system of the GNU
Operating System. Use info to access the top level info
page. Use info plzip to access the plzip section directly.
An online manual for plzip can be found
The latest released version of plzip can be found
You may also subscribe to
and receive an email every time a new version is released.
Hannes Domani kindly provided a Windows port of plzip that can also be
downloaded from the Savannah download link just above.
How to Get Help
For general discussion of bugs in plzip the mailing list
is the most appropriate forum. Please send messages as plain text.
Please do not send messages encoded as HTML nor encoded as base64 MIME
nor included as multiple formats. Please include a descriptive subject
line. If all of the subject are "bug in plzip" it is impossible to
An archive of the bug report mailing list is available at
How to Help
To contact the author, either to report a bug or to contribute fixes or
improvements, send mail to
Please send messages as plain text. If posting patches they should be in
unified diff format against the latest version. They should include a
See also the
project page at Savannah.
This program is free software: you can redistribute it and/or modify it
under the terms of the GNU
General Public License as published by the Free Software Foundation,
either version 3 of the License, or (at your option) any later version.
Copyright © 2014 Antonio Diaz Diaz
Lzip logo Copyright © 2013 Sonia Diaz Pacheco
You are free to copy, modify and distribute all or part of this article