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@clacke Pantheon Files can compress and extract 7z files (actually Archive Manager from GNOME does the work)

https://wiki.gnome.org/Apps/FileRoller

@diti you are right that it does not offer compression level settings. other GUIs might have them

there is an open issue for that https://gitlab.gnome.org/GNOME/file-roller/-/issues/89

there is ark from kde as an example that have this setting. maybe that's for you? https://apps.kde.org/ark/

not sure if 7-Zip still has the best compression. there are some very performant new ones