Lhasa lha is a tool for parsing LHA (.lzh) archives and a free replacement for the Unix LHA tool.

Currently it is only possible to read from (ie. decompress) archives; generating (compressing) LHA archives may be an enhancement for future versions. The aim is to be compatible with as many different variants of the LHA file format as possible, including LArc (.lzs) and PMarc (.pma).

The command line tool aims to be interface-compatible with the non-free Unix LHA tool (command line syntax and output), for backwards compatibility with tools that expect particular output.