Usually, 7-Zip compresses to 7z format 30-70% better than to zip format. 7-Zip is completely free, open-source software with open source under the GNU LGPL license. Download 7-Zip 22 for Windows XP, Vista, 7, 8, 10, 11 - A file archiver featuring a high compression ratio to extract or create compressed files in multiple formatsħ-Zip is a file archiver featuring a high compression ratio to extract or create compressed files in multiple formats.