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XZ Utils vs Zstandard: catalog facts
XZ Utils	Zstandard
Free The software is free under its open-source licence. Hosting, hardware and external…	Free Free and open source, dual licensed BSD or GPLv2.
Windows, macOS, Linux, Command line	Windows, macOS, Linux, Command line
LZMA2 compression gives some of the best ratios available for general-purpose data, and the tools ship on effectively…	Compression close to zlib's ratio at several times the speed, and much faster decompression The format is standardised in RFC 8878 with multiple independent implementations
Compression is slow and memory-hungry at high levels, and the 2024 backdoor incident in the upstream release tarballs…	A command-line tool with no graphical interface of its own Maximum ratio is below xz or 7z at their slowest settings, which is the trade it makes on…
Downloadable app	Downloadable app
Open source	Open source
License: 0BSD	License: BSD-3-Clause
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 21, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.