Unlike WinRAR, which famously "asks" for a license forever, 7-Zip is completely free for personal and commercial use under the GNU LGPL license.
It provides "military-grade" AES-256 encryption . When using the 7z format, it can even encrypt filenames so no one can see what's inside the archive without the password.
It introduced the 7z format , which often compresses files 30–70% better than the standard ZIP format.
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