LZMA SDK (Software Development Kit)

The LZMA SDK provides the documentation, samples, header files, libraries, and tools you need to develop applications that use LZMA compression.

Link Size Date Version Description
Download 1.6 MB 2024-06-19 24.07 LZMA SDK
C, C++, C#, Java
x86/x64 binaries for Windows
Download 1 MB 2023-06-20 23.01
Download 12 KB 2015-06-14 LZMA Specification (Draft)

What's new:

  • 24.05: New filter for RISC-V executables.
  • 23.01: New filter for ARM64 executables. BCJ2 filter was improved for better compression ratio. Some bugs were fixed.
  • 21.07: Some minor changes and fixes.
  • 21.06: The bug in LZMA encoding function was fixed.
  • 21.03 beta: LZMA dicrionary up to 4 GB. Speed optimizations.
  • 21.02 alpha: macOS and Linux support. Speed optimizations.
  • 19.00: Encryption strength for 7z archives was increased.
  • 18.06: Some speed optimiztions in LZMA/LZMA2 code.
  • 18.05: Some speed optimiztions in LZMA/LZMA2 code.
  • 18.01: Some changes in LZMA2/xz multithreading code for compressing. Some bugs were fixed.
  • 9.35: AES code and SFXs modules were included to SDK.
  • 9.20: New small SFX module for installers.
  • 9.11: PPMd support.
  • 9.04: LZMA2 and XZ support.
  • 4.62: LZMA SDK is placed in the public domain.

LZMA / LZMA2 are default and general compression methods of 7z format in the 7-Zip program. LZMA provides a high compression ratio and fast decompression, so it is very suitable for embedded applications. For example, it can be used for ROM (firmware) compressing.

LZMA SDK includes:

  • C++ source code of LZMA Encoder and Decoder
  • C++ source code for .7z compression and decompression (reduced version)
  • ANSI-C compatible source code for LZMA / LZMA2 / XZ compression and decompression
  • ANSI-C compatible source code for 7z decompression with example
  • C# source code for LZMA compression and decompression
  • Java source code for LZMA compression and decompression
  • lzma.exe for .lzma compression and decompression
  • 7zr.exe to work with 7z archives (reduced version of 7z.exe from 7-Zip)
  • SFX modules to create self-extracting packages and installers

ANSI-C and C++ source code in LZMA SDK is subset of source code of 7-Zip.

LZMA features:

  • Compression speed: 2-8 MB/s on 4 GHz CPU using two cpu threads.
  • Decompression speed on single cpu thread:
    • 30-100 MB/s on modern 4 GHz CPU (Intel, AMD, ARM).
    • 5-15 MB/s on simple 1 GHz RISC CPU (ARM, MIPS, PowerPC).
  • Small memory requirements for decompression: 8-32 KB + DictionarySize
  • Small code size for decompression: 2-8 KB (depending on speed optimizations)

The LZMA decoder uses only CPU integer instructions and can be implemented for any modern 32-bit CPU.


LZMA SDK is placed in the public domain.

Anyone is free to copy, modify, publish, use, compile, sell, or distribute the original LZMA SDK code, either in source code form or as a compiled binary, for any purpose, commercial or non-commercial, and by any means.

LZMA Links

Copyright (C) 2024 Igor Pavlov.