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Modern7z vs mozlz4: catalog facts
Modern7z	mozlz4
Free Freeware under TC4Shell's terms of use.	Free Free and open source under the MIT licence.
Windows	Windows, Linux, Command line
Adds Zstandard, Brotli, LZ4 and other modern methods to 7-Zip Opens Zip archives compressed with ZSTD or Brotli	Opens Firefox's mozlz4 files that general archivers cannot read Compresses edited files back into mozlz4
Needs 7-Zip and a manual install into its Codecs folder The new methods compress single files, so multiple files need a TAR container	Overwrites existing output files without asking Single-purpose tool with a small feature set
Downloadable app	Downloadable app
Closed source	Open source
License: Freeware	License: MIT
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 October 2, 2026

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