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Version 2.10

01 Mar 2017

Copyright (C) 1996 - 2017
Markus F.X.J. Oberhumer

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  • LZO 2.10 has been released; a small update that fixes various build issues.

Key Facts

  • LZO is a portable lossless data compression library written in ANSI C.
  • Offers pretty fast compression and *extremely* fast decompression.
  • One of the fastest compression and decompression algorithms around. See the ratings for lzop in the famous Archive Comparison Test .
  • Includes slower compression levels achieving a quite competitive compression ratio while still decompressing at this very high speed.
  • Distributed under the terms of the GNU General Public License (GPL v2+). Commercial licenses are available through our LZO Professional license program.


LZO is distributed as portable ANSI C source code.

Download LZO (source code, 587 kB, SHA1: 4924676a9bae5db58ef129dc1cebce3baa3c4b5d).


miniLZO is a very lightweight subset of the LZO library intended for easy inclusion with your application. It is generated automatically from the LZO source code and contains the most important LZO functions.

Very easy to use - it only takes a few minutes to add data compression to your application!

Download miniLZO (source code, 62 kB, SHA1: c7432708d49017a3f0b4f44c99d336f8a1be84f5).

Related links

  • LZO Professional is our commercial LZO license program.
  • If you need better compression you should take a look at the excellent zlib library. zlib is slower and needs more memory, though.
  • For even better compression consider using libbzip2 which is distributed with the bzip2 file compressor.
  • The file compressor application lzop uses LZO - it is very similar to gzip but much faster.