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GNU Gzip vs Zopfli: catalog facts
GNU Gzip	Zopfli
Free Free software from the GNU Project.	Free Free and open source from Google.
Linux, Command line	Command line
Available on nearly every Unix-like system The .gz format is read almost everywhere	Smaller output than standard gzip at its highest level Output readable by any gzip, zlib or deflate decoder
Compresses single files or streams, not multi-file archives Lower compression ratio than xz, zstd or lzip	Much slower than ordinary compressors Compresses only; decompression uses standard tools
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 2, 2026

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