what are 7-zip files
Free 7z file archiver
   DOWNLOAD PEAZIP FREE RAR AND ZIP UTILITY
ONLINE SUPPORT SOFTWARE'S FAQ
LEARN MORE
what are 7z files
7z 7zip aes encryption
7-zip compression speed .7z lzma compression ratio
7z file extension

free 7-zip files utility

PeaZip is a free cross-platform file archiver that provides an unified portable GUI for many Open Source technologies like 7-Zip, FreeArc, PAQ, UPX...
Create 7Z, ARC, BZ2, GZ, *PAQ, PEA, QUAD/BALZ, TAR, UPX, WIM, XZ, ZIP files
Open and extract over 180 archive types: ACE, ARJ, CAB, DMG, ISO, LHA, RAR, UDF, ZIPX files and more...
Features of PeaZip includes extract, create and convert multiple archives at once, create self-extracting archives, split/join files, strong encryption with two factor authentication, encrypted password manager, secure deletion, find duplicate files, calculate hashes, export job definition as script.

free 7z software

7zip files
FAQ / COMMON ARCHIVE FORMATS > 7Z FILE FORMAT
7z archive type

7Z file format (7-Zip archives)



WHAT IS 7Z FILE FORMAT

7z extension



7Z extension designates a popular archiving format, created for 7-Zip, a modern file archiver application written by Igor Pavlov and released as freeware and Open Source software. 7-Zip (often incorrectly shortened in 7zip) was originally developed for Microsoft Windows platforms, and ported by p7zip (POSIX-7Zip) project team on Unix platforms.
Spanned multi-volume 7z archives are designated by .001 extension, incrementing file extension numerator for each successive volume of the set - spanned 7z files are split byte-wise, this raw splitting mechanism being compatible with Unix / Linux "split" command and Windows utilities like HJSplit.

7Z is capable of very high compression ratio through powerful compression algorithms (LZMA, LZMA2, PPMd, BZip2, optionally optimized Deflate), at cost of more memory and CPU intensive compression process - that however can take benefit of parallel computing on modern multicore CPUs.
On average test cases 7Z format improves compression ratio 30-70% better over classic ZIP format, and 6-7% better than RAR files (WinRar's native format, proprietary). 7Z compression compares favourably also with new WinZip's ZIPX format in most cases.
7Z format also provides native UTF-8 support for filenames, Rijndael/AES encryption, and volume spanning.

Read more on 7-Zip official domain7zip software domain, p7zip projectp7zip POSIX port of 7-Zip for Unix and Unix-like operating systems, 7Z file format specifications7zip specifications, 7Z format Wikipedia entry7zip archive format, PPMdWikipedia prediction by partial matching and LZMA/LZMA2Lempel Ziv Markov chain algorithm data compression algorithms.

When is 7Z format recommended

.7z is a good choice anytime it is important to attain a superior compression ratio, and it is welcome the support for strong encyption to keep archived data private. PeaZip also supports creation of 7z-format self extracting archives (SFX), so recipient will not need a 7-Zip compatible extractor when receiving one of those self-extracting files.

XZ extension identify a pure compression format (compresses a single file, without offering option of archiving multiple input file into a single output .xz file), it is based on LZMA/LZMA2 algorithm family, providing the usual 7z-like compression ratio (similar or higher compared to RAR), recently often used on TAR files.

PeaZip supports creation and extraction of 7z files: create, open, browse, and extract 7Z archives, convert any supported archive to 7z format and vice-versa.

  



  

.7Z

Author Igor Pavlov, 1999

SPEED 7z archives

Average. Computing intensive compression algorithms are balanced by efficient parallel programming implementation.







COMPRESSION RATIO 7z compression ratio

Very good. Comparable, often better than WinRar's RAR compression, but inferior to state of art PAQ compressor.

ADVANCED OPTIONS 7z
Good. Native support for AES encryption and UTF-8 encoding. Lacks recovery records option available for RAR format.








RELATED & SIMILAR PAGES
MANAGE 7-ZIP FILES
ARCHIVE FORMATS COMPARISON
HOW TO IMPROVE FILE COMPRESSION
Tag Cloud
7-Zip archives 7Z 7Zip 7Z/XZ format download 7Z archiver what is 7Z file format create new compressed archive add to separate archives extract selected files how to open 7z rar tar zip files checksum hash tool convert 7Z RAR ZIP files download file archiver extract ACE archives extract CAB file extract encrypted file extract 7Z RAR TAR ZIP files free RAR software how to encrypt files how to split files open 7Z archives open RAR files open ZIP files portable 7Z RAR ZIP software RAR file format secure delete TAR file extraction what is ZIP format ZIP utility ZIPX file extraction





7z archives
DOWNLOADS
7-zip archives
All PeaZip downloads
PeaZip for Windows 32 bit
PeaZip for Windows 64 bit
PeaZip Portable
PeaZip Linux/BSD
7z format
SUPPORT
7-zip file format
Online help
Frequently Asked Questions
More information





7z packages
DONATE
7-zip files
Support PeaZip project, or donate to FAO, UNICEF and UNESCO from donation page

© PeaZip srl: TOS, Privacy
OSDN software repository
free rar downloads
SourceForge software repository
free rar
Releases Feed zipx files
PeaZip Wiki rar files
Developer email download rar software
Search knowledge-base
rar archiver