What is a .ZST file?
ZST is a file compressed with Zstandard, prized for being fast and efficient.
- Did you know
- Zstandard was created by Facebook in 2016 and is now used everywhere from Linux to game engines.
- Zstandard was created by Yann Collet, who is also the author of the even faster LZ4 algorithm.
- The format pairs LZ77-style matching with Finite State Entropy and Huffman coding, and can train a custom dictionary to compress many tiny files far better.
- Zstandard is standardised as IETF RFC 8478, which also registers the “.zst” extension and the “zstd” HTTP content-encoding.
- What Analyser shows you
- Browse the file tree and compression details of archives without extracting them: ZIP in pure JavaScript, and RAR, 7z, TAR and compressed tarballs (.tar.gz / .tgz, .tar.xz, .tar.zst, .tar.bz2) through a bundled libarchive engine - click any file inside to analyse it. A single compressed stream (.gz, .xz, .zst, .lz4, .lzma, .Z) is decompressed so the file within can be opened; bare .bz2 streams are identified only.
- Open a .ZST file
- Drag a .ZST file onto the Analyser home page (or tap to pick one). It opens entirely in your browser - nothing is uploaded, there is no account, and it works offline once installed.