Zstandard

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File Format
Name Zstandard
Ontology
Extension(s) .zst
MIME Type(s) application/zstd
Released 2015

Zstandard, or Zstd, is a general-purpose compression algorithm and file format. It is designed to have a good balance between compression ratio, compression speed, and decompression speed.

Zstandard is able to use a "dictionary" format to make compression of files of an already known type more efficient.

Contents

Identification

For at least some versions of Zstd format, files begin with signature bytes 25 b5 2f fd. For files created since version 0.8.0 (August 2016[1]), the header is instead 28 b5 2f fd[2].

Software

Links

References

  1. https://github.com/facebook/zstd/releases/tag/v0.8.0
  2. https://github.com/facebook/zstd/blob/dev/lib/zstd.h, definition of ZSTD_MAGICNUMBER
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