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Pdlzip is a lossless data compressor with a user interface similar to the one of lzip, bzip2 or gzip.

Pdlzip uses the lzip file format; the files produced by pdlzip are (hope)fully compatible with lzip-1.4 or newer. Pdlzip is in fact a permissively licensed implementation of the lzip data compressor, intended for those who can't distribute (or even use) GPL licensed Free Software.

The lzip file format is designed for data sharing and long-term archiving, taking into account both data integrity and decoder availability:

A nice feature of the lzip format is that a corrupt byte is easier to repair the nearer it is from the beginning of the file. Therefore, with the help of lziprecover, losing an entire archive just because of a corrupt byte near the beginning is a thing of the past.

Pdlzip is also able to decompress legacy lzma-alone (.lzma) files. Lzma-alone is a very bad format. If you keep any lzma-alone files, it is advisable to recompress them to lzip format.

Pdlzip is written in C.

Pdlzip includes public domain (de)compression code from the LZMA SDK (Software Development Kit) written by Igor Pavlov.

I would not write non-copylefted software unless it is too simple to be worth copylefting it, but one of the uses of the lzip format is the interchange of information, and it is therefore desirable that even the users of the most non-free platforms can share lzip files with everybody else.

Learn more about lzip in the Lzip Home Page.


Pdlzip only includes a man page and a README file. For information about the lzip file format see the online manual of lzip below.

The manual is available in the info system of the GNU Operating System. Use info to access the top level info page. Use info lzip to access the lzip section directly.

An online manual for lzip can be found here.


The latest released version of pdlzip can be found here. You may also subscribe to lzip-bug and receive an email every time a new version is released.

How to get help

For general discussion of bugs in pdlzip the mailing list lzip-bug@nongnu.org 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 pdlzip" it is impossible to differentiate them.

An archive of the bug report mailing list is available at http://lists.gnu.org/mailman/listinfo/lzip-bug.

How to help

To contact the author, either to report a bug or to contribute fixes or improvements, send mail to lzip-bug@nongnu.org. Please send messages as plain text. If posting patches they should be in unified diff format against the latest version. They should include a text description.

See also the lzip project page at Savannah.


Pdlzip is free software. The (de)compression code is in the public domain. The rest is under a 2-clause BSD license.

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Copyright © 2015 Antonio Diaz Diaz
Lzip logo Copyright © 2013 Sonia Diaz Pacheco

You are free to copy, modify and distribute all or part of this article without limitation.

Updated: 2015/06/04