Zstandard (zstd) Compressed
Zstandard (zstd) is a modern compression algorithm that provides an excellent balance of speed and compression ratio. It compresses and decompresses significantly faster than gzip at similar or better ratios, and it supports dictionary compression for small data.
MIME Type
application/zstd
Type
Binary
Compression
Lossless
Advantages
- + 2-5x faster than gzip at comparable compression ratios
- + Wide compression level range (1-22) from real-time to archival
- + Dictionary mode excels at compressing small, similar payloads
- + Supported in HTTP content encoding and modern Linux distributions
Disadvantages
- − Newer format with less universal tool support than gzip
- − Not natively supported by older operating systems
- − Maximum compression levels are slower than xz for marginal gains
When to Use .ZST
Use Zstandard as a modern replacement for gzip — web content delivery, log compression, package archives, and any workload needing fast compression with good ratios.
Technical Details
Zstandard combines LZ77 matching with a tANS (finite state entropy) encoder and supports 22 compression levels. Dictionary mode pre-trains on sample data for superior compression of small, similar payloads.
History
Yann Collet (also the creator of LZ4) developed Zstandard at Facebook in 2015. It was released as open source in 2016 and standardized as RFC 8478. Adoption has grown rapidly in Linux packages, HTTP, and databases.