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pigz vs Zopfli: catalog facts
pigz	Zopfli
Free Free and open source with no paid tier.	Free Free and open source from Google.
Linux, Command line	Command line
Uses all CPU cores when compressing Output is standard gzip format	Smaller output than standard gzip at its highest level Output readable by any gzip, zlib or deflate decoder
Decompression gains little from multiple cores Distributed as source code; you may need to compile it	Much slower than ordinary compressors Compresses only; decompression uses standard tools
Downloadable app	Downloadable app
Open source	Open source
License: Zlib	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.