7-Z file extension - 7z compressed archive file
What is 7-z file? How to open 7-z files?
File type specification:
7-z file icon:
Default file extension for 7z compressed archive file is 7z.
7z is the new backup, archive - compressed file format, providing high compression ratio.
The main features of 7z 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 has an open architecture, so it can support any new compression method, too. The following methods currently are integrated into 7z:
|LZMA||Improved and optimized version of LZ77 algorithm|
|PPMD||Dmitry Shkarin's PPMdH with small changes|
|BCJ||Converter for 32-bit x86 executables|
|BCJ2||Converter for 32-bit x86 executables|
|BZip2||Standard BWT algorithm|
|Deflate||Standard LZ77-based algorithm|
LZMA is the default and general compression method of 7z format. The main features of LZMA are:
- High compression ratio
- 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 is part of the 7-Zip program distributed under the GNU LGPL.
The default software associated to 7-z file type:
Company or developer:
7-Zip is a free file archiver developed by Igor Pavlov featuring higher compression ratios with LZMA and LZMA2 compression.
It is mainly available for Windows platform (for Mac and Linux are available command line tools) and is the primary program to handle 7z archives. However, also supports various compression file formats.
Packing / unpacking: 7z, XZ, BZIP2, GZIP, TAR, ZIP and WIM
Unpacking only: AR, ARJ, CAB, CHM, CPIO, CramFS, DMG, EXT, FAT, GPT, HFS, IHEX, ISO, LZH, LZMA, MBR, MSI, NSIS, NTFS, QCOW2, RAR, RPM, SquashFS, UDF, UEFI, VDI, VHD, VMDK, WIM, XAR and Z
List of software applications associated to the .7-z file extension
Recommended software programs are sorted by OS platform (Windows, Mac OS X etc.) and possible program actions
that can be done with the file: like open 7-z file, edit 7-z file, convert 7-z file, view 7-z file, play 7-z file etc. (if exist software for corresponding action in File-Extensions.org's database).
Click on the tab below to simply browse between the application actions, to quickly get a list of recommended software, which is able to perform the specified software action, such as opening, editing or converting of the 7-z files.
- Open 7-z file
- Save 7-z file
- Edit 7-z file
- View 7-z file
- Convert 7-z file
- Create 7-z file
- Extract 7-z file
- Backup 7-z file
- Others 7-z file