System Utilities · Reviewed
7-Zip
A free file archiver built around the 7z format, offering high-ratio compression, extraction of many archive types and graphical and command-line workflows.
Overview
7-Zip packages files into compressed archives and extracts material from many common formats. Its native 7z format supports compression methods such as LZMA and LZMA2, while ZIP support makes it useful for more widely exchanged archives. Supported creation formats and extraction formats are different lists.
On Windows, a file-manager interface and shell integration provide convenient access to everyday archive tasks. Command-line tools allow the same operations to be incorporated into scripts. Encryption is available for supported formats, with the practical result depending on archive settings and the software used to open it.
Key features
- 7z, ZIP and other archive creation
- Broad archive extraction support
- LZMA and LZMA2 compression
- Encryption for supported formats
- File-manager and command-line interfaces
Historical significance
7-Zip made strong general-purpose compression readily available without a commercial archiver purchase. Its significance extends from everyday file exchange to automated packaging and the wider adoption of LZMA-based compression. It is also a useful example of a focused utility whose open-source implementation became infrastructure for other software.
History and development
Igor Pavlov began 7-Zip in 1999. The project developed its own 7z container and compression implementation while also supporting established archive formats. Its freely available code and command-line tools encouraged uses beyond the graphical Windows application.
Later development added LZMA2, more format support and official command-line builds for additional operating systems. Long-running maintenance has included changes for newer processors, archive structures and security issues. The product should be distinguished from similarly named download sites or independent repackagings: the project's own distribution is at 7-zip.org.