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7-Zip-zstd vs Modern7z: catalog facts
7-Zip-zstd	Modern7z
Free The software is free under its open-source licence. Hosting, hardware and external…	Free Freeware under TC4Shell's terms of use.
Windows, Linux	Windows
It keeps the familiar 7-Zip interface and Explorer menu while adding modern codecs, and it can be installed…	Adds Zstandard, Brotli, LZ4 and other modern methods to 7-Zip Opens Zip archives compressed with ZSTD or Brotli
Archives that use the added codecs will not open in stock 7-Zip, so they are not safe to…	Needs 7-Zip and a manual install into its Codecs folder The new methods compress single files, so multiple files need a TAR container
Downloadable app	Downloadable app
Open source	Closed source
License: BSD-3-Clause	License: Freeware
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked October 2, 2026

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