The File Extensions Database

.7-ZIP File Extension

  • Developer by: Igor Pavlov
  • Category: Archive and compressed Files

What is an .7-ZIP file?

.7-ZIP is 7z compressed archive

The 7-zip file extension is used for native file format of 7-ZIP archiver

7z is the new backup and archive file format, providing high compression ratio.

The main features of 7z file format:
- Open architecture
- High compression ratio
- Strong AES-256 encryption
- Ability of using any compression, conversion or encryption method
- Support for very large files with sizes up to 16000000000 GB
- Unicode file name support
- Solid compression ratio
- Archive headers compression

7z file format has an open architecture, so it can support any new compression methods. LZMA is the default and general compression method of 7z file format.
The main features of LZMA are:

  • Variable dictionary size (up to 4 GB)
  • Compression speed: about 1 MB/s on 2 GHz CPU
  • Decompression speed: about 10-20 MB/s on 2 GHz CPU
  • Small memory requirement for decompression (depend from dictionary size)
  • Small code size for decompression: about 5 KB
  • Supports multi-threading and P4's hyper-threading

The LZMA compression algorithm is very suitable for embedded applications. LZMA is released under the terms of the GNU LGPL.

7-Zip supports encryption with the AES-256 algorithm. This algorithm uses a cipher key with a length of 256 bits. To create that key, 7-Zip runs a derivation function based on a SHA-256 hash algorithm. A key derivation function produces a derived key from the text password entered by the user. To increase the cost of an exhaustive search to crack a password, 7-Zip uses a large number of iterations when it produces a cipher key from a password.

7z file format was developed as as part of the 7-Zip compression utility distributed under the GNU LGPL.

MIME types:

How to open:

Use 7-zip, or applications that support 7z archives include WinRAR, PowerArchiver, TUGZip, and IZArc.

How to convert:

Extract an archive and then use files from archive or backup files into another archive file format (eg. rar, zip etc.)

How to solve problems with 7-ZIP files

  • Associate the 7-ZIP file extension with the correct application. On :
    Windows: Right click on any 7-ZIP file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.7-ZIP files". Mac: Right click (or Ctrl-click) the 7-ZIP file, then click "Open with" > "Other...". Then choose another program and check the "Always Open With" box. Linux: Right click on the file, and select "Open with" and choose another program. iPhone: Tap the file. If you do not see an app to open the file, then tap Share "Share" and choose an app. Alternatively, save the file. Then open the Files app Files app. There long-press on the file, then release your finger. You will see a black menu bar. Then tap "Share" and select an app. Android: Tap the Settings icon on your smartphone, then tap on the Apps section. There tap the Options icon in the top right-hand corner of the screen to change the default apps.
  • Update your software that should actually open .7-ZIP is 7z compressed archive. Because only the current version supports the latest 7-ZIP file format. Search, therefore, e.g. on the Igor Pavlov manufacturer website after an available .7-ZIP is 7z compressed archive update.
  • To make sure that your 7-ZIP file is not corrupted or virus-infected, get the file again and scan it with antivirus software.