zchunk ☆
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Description:
Compressed file format for efficient deltas
Type: Formula  |  Tracked Since: Dec 28, 2025
Links: Homepage  |  formulae.brew.sh
Category: System utilities
Tags: compression delta-encoding file-format networking efficiency
Install: brew install zchunk
About:
Zchunk is a compressed file format designed for efficient network transmission and storage. It splits files into individual chunks, allowing for differential updates where only modified portions need to be re-downloaded and re-compressed. This significantly reduces bandwidth usage and update times for large datasets like software repositories.
Key Features:
  • Chunk-based compression for granular updates
  • Deduplication of unchanged data segments
  • Support for multiple compression algorithms (ZSTD, LZMA, etc.)
  • Integrity verification via checksums
  • Standardized format compatible with existing tools
Use Cases:
  • Efficiently updating large software package repositories
  • Distributing container images or virtual machine snapshots
  • Reducing bandwidth costs for content delivery networks
  • Synchronizing large datasets over limited connections
Alternatives:
  • bsdiff – Zchunk operates on a stream or file level with chunking, while bsdiff creates binary patches between two specific file versions.
  • zstd – Zstd provides high-performance compression, but Zchunk adds the critical feature of chunking for efficient partial updates without re-compressing the whole file.
Version History
Detected Version Rev Change Commit
Sep 11, 2025 7:06pm 0 VERSION_BUMP 27ed942d
Sep 11, 2024 3:06pm 0 VERSION_BUMP 9d3ce94b
Jul 20, 2024 3:49am 0 VERSION_BUMP 0abb7583
Dec 20, 2023 8:46am 0 VERSION_BUMP afa77def
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