Seekable, deduplicated compression format built in Rust.

Hexz packs large datasets into compressed, indexed archives that support instant random access — no full decompression needed. Originally built to boot virtual machines over the network in milliseconds.

pip install hexz           # Python library
cargo install hexz-cli     # CLI tool

Pre-built binaries for Linux, macOS, and Windows are available on the releases page.

• Seekable compression — Random access to any byte offset without decompressing the whole file
• Block-level deduplication — BLAKE3 hashing + FastCDC content-defined chunking
• Thin snapshots — Parent-child delta storage (v2 only stores what changed from v1)
• Streaming from S3 — Only fetches the blocks you need, with prefetch and caching
• Cross-platform — Linux, macOS, Windows (x86_64 and aarch64)

• Documentation
• PyPI
• crates.io