.7z — 7-Zip Compressed File
Igor Pavlov · 1999
What is a .7z file?
The .7z file extension denotes a 7-Zip compressed archive, a highly efficient data compression format developed by Igor Pavlov. It supports a wide range of compression algorithms, including LZMA and LZMA2, often achieving higher compression ratios than traditional ZIP files. 7z archives can also feature strong AES-256 encryption and support for solid compression, making them suitable for secure and efficient storage or transfer of large datasets.
Programs That Open .7z Files
| Platform | Program | ||
|---|---|---|---|
| Windows | 7-Zip | Free | Official |
| WinRAR | Paid | ||
| PeaZip | Free | ||
| macOS | Keka | Free | |
| The Unarchiver | Free | ||
| BetterZip | Paid |
Common Problems with .7z Files
Frequently Asked Questions
7z typically offers better compression ratios than ZIP, especially with its LZMA and LZMA2 algorithms, resulting in smaller file sizes for the same data.
Yes, 7z supports strong AES-256 encryption for securing archive contents, allowing users to protect their compressed data with a password.
Yes, the 7z format is open-source, and its primary archiving tool, 7-Zip, is also free and open-source software.
Technical Details
A 7z archive typically begins with the header signature `37 7A BC AF 27 1C` (hexadecimal), identifying it as a 7-Zip file. The format supports various compression methods like LZMA, LZMA2, PPMD, BCJ, and BZip2, enabling advanced features such as self-extracting archives, strong encryption (AES-256), and multi-volume archives.