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

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