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LZMA vs ZST

LZMA vs ZST

A detailed comparison of LZMA Compressed and Zstandard Compressed — file size, quality, compatibility, and which format to choose for your workflow.

Convert LZMA → ZST Convert ZST → LZMA
LZMA

LZMA Compressed

Archives & Compressed

LZMA (Lempel-Ziv-Markov chain Algorithm) is a high-ratio compression algorithm developed by Igor Pavlov for the 7-Zip archiver. It achieves significantly better compression than gzip or bzip2, especially on text and binary data, at the cost of higher memory usage.

About LZMA files
ZST

Zstandard Compressed

Archives & Compressed

Zstandard (Zstd) is a fast lossless compression algorithm developed by Yann Collet at Facebook. It provides compression ratios comparable to zlib while being 3-5x faster at both compression and decompression, making it ideal for real-time data processing.

About ZST files

Strengths Comparison

LZMA Strengths

  • Highest-ratio mainstream compression (beats gzip by 30%).
  • Public domain SDK — royalty-free.
  • Mature since 1998 with no breaking changes.
  • Core of 7z, xz, .tar.xz workflows.
  • Multi-threaded LZMA2 scales across CPU cores.

ZST Strengths

  • Extremely fast decompression (~2 GB/s on modern CPU).
  • Scalable: very fast at level 1, near-xz ratios at level 22.
  • Dictionary support for small-payload efficiency.
  • Multi-threaded by default.
  • Standardized (RFC 8478), BSD-licensed reference.

Limitations

LZMA Limitations

  • Slow compression at highest settings.
  • Memory-hungry — 1 GB+ for extreme compression levels.
  • Zstandard matches its ratios at less memory cost.
  • Raw .lzma files are rare — usually wrapped in .7z, .xz, or .tar.xz.

ZST Limitations

  • Newer than gzip/bzip2 — some legacy tools still lack support.
  • At extreme compression levels, xz can still win on ratio.
  • Memory usage at high levels is significant.
  • Consumer archiving tools (Windows Explorer) lag behind.

Technical Specifications

Specification LZMA ZST
MIME type application/x-lzma application/zstd
Extensions .lzma, .lz —
Algorithm Lempel-Ziv-Markov chain + range coding LZ77 variant + entropy coding (FSE/Huffman)
Public domain SDK Yes (since 2001) —
Variants LZMA (original), LZMA2 (multi-threaded, used in xz) —
Extension — .zst
Standard — RFC 8478 (2018)
Compression levels — 1-22 (plus negative "fast" levels)

Typical File Sizes

LZMA

  • Text/source archive 15-25% of original
  • Linux kernel source (.tar.xz = LZMA2) ~125 MB
  • Windows system backup (.lzma) 25-40% of original

ZST

  • Default level 3 on source code 28-35% of original
  • Level 22 ultra on source code 14-18% of original
  • Linux kernel (.tar.zst, level 19) ~130 MB

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Frequently Asked Questions

LZMA (LZMA Compressed) is an archive format used to bundle multiple files and folders into a single compressed file. The archive preserves the directory structure and typically reduces total size via compression. LZMA sits in the archives & compressed family and has specific strengths around compression ratio, speed, or platform support.

LZMA (LZMA comprimido) is an archive formato used to bundle multiple arquivos e folders em a single comprimido file. The archive preserves the directory structure e tipicamente reduces total size via compressão. LZMA sits no archives & comprimido family e has specific strengths around compressão ratio, speed, ou plataforma support.

7-Zip, WinRAR, The Unarchiver (macOS), and the built-in archive utilities on Windows and macOS open most LZMA files. For command-line extraction, 7z, unar, or the format-specific tool handles LZMA cleanly. If your extractor does not recognise LZMA, convert to ZIP first — ZIP opens on every operating system without extra software.

7-Zip, WinRAR, The Unarchiver (macOS), e the built-in archive utilities no Windows e macOS abrir most LZMA files. para command-line extraction, 7z, unar, ou the formato-specific tool handles LZMA cleanly. If your extractor does not recognise LZMA, converter to ZIP first — ZIP opens on every operating system sem extra software.

Upload the LZMA to KaijuConverter and pick ZIP, 7Z, TAR.GZ, or RAR as the target. Our pipeline extracts the original archive and re-compresses the contents into the target format. File permissions, timestamps, and directory structure are preserved where both formats support them.

Depends on the goal. ZIP is the universal baseline — every OS extracts it out of the box. Formats like 7Z or TAR.GZ compress better but require specific tools. LZMA may win on compression ratio, password support, or OS integration for specific workflows; ZIP wins on raw compatibility.