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Zopfli vs pigz: catalog facts
Zopfli	pigz
Free Free and open source from Google.	Free Free and open source with no paid tier.
Command line	Linux, Command line
Smaller output than standard gzip at its highest level Output readable by any gzip, zlib or deflate decoder	Uses all CPU cores when compressing Output is standard gzip format
Much slower than ordinary compressors Compresses only; decompression uses standard tools	Decompression gains little from multiple cores Distributed as source code; you may need to compile it
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: Zlib
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.