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7-Zip is a file archiver with a high compression ratio. 7-Zip is open source software. Most of the source code is under the GNU LGPL license. The unRAR code is under a mixed license: GNU LGPL + unRAR restrictions. Check license information here: 7-Zip license.

You can use 7-Zip on any computer, including a computer in a commercial organization. You don’t need to register or pay for 7-Zip.

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If you are looking for a free program to compress and extract file archives which is easy to use, fast and really effective, have a chance at 7-Zip, a completely open source program. Despite some limitations in terms of security, you will be pleasantly surprised. The program uses the 7Z, a compression format that improves the results of the classic ZIP up to 50 percent.

Compress the size of files without losing information. In addition to extract without problems almost all compressed formats in circulation, 7-Zip lets you choose among five formats when you want to compress a file: 7Z, ZIP, GZIP, BZIP2 and TAR. The 7-Zip integrates with Windows context menu. Open with one right click mouse button and navigate quickly and conveniently to basic options presented.

In addition to the proprietary format (7Z), 7-Zip works with many others including ZIP, RAR, CAB, ARJ, LHZ, TAR, GZIP and TAR. Versatility is one of the strengths of the application. Don’t miss quality or speed when compressing files. Use the 7-Zip and decrease the size of the documents.

In short, 7-Zip is an excellent substitute for WinZip and WinRar and is also free.