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FAQ / SUPPORTED FILE FORMATS > BZ2 FILES
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BZ2 file, BZip2 compression algorithm



BZ2 FILE FORMAT

CREATE, OPEN, EXTRACT BZ2 FILES

BZIP2 FILES, READ MORE

extract bzip file



BZ2 extension represents a pure data compression format not providing file archival feature, its BZip2 compression algorithm is based on Burrows–Wheeler transform.

Compression speed is somewhat slower than zip/gzip classic Deflate algorithm (even if Bzip2 algorithm can be easily made parallel, and benefit of recent multi-core CPU), but faster than more powerful compression schemes as in RAR and 7Z formats. Compression ratio, also, is usually intermediate between older Deflate-based ZIP/GZ files and modern RAR, 7Z, ZPX formats.

Compressed files are usually identified by .bz2 extension, and can contain a single input file.
Due this by-design limitation, on Unix/Linux systems BZip2 compression (as well as Gzip, XZ,...) is usually cascaded to TAR archiving -  multiple files data and metadata (file attributes, date/time etc) are consolidated into a single uncompressed .tar container - producing TBZ2 file, which can be identified with TBZ, TB2, or TAR.BZ2 extension. Hint: learn more about files with double extension.

PeaZip is a free archive manager tool which, both on Microsoft Windows and Linux systems, can read (open, test and extract) and write (compress to) Bzip2 format.

When is BZ2 format recommended
BZip2 compression is usually applied to TAR archives, which is usually employed to provide archiving of data and metadata on Unix and Unix-like systems.

  



  

.BZ2

Author Julian Seward, 1996

SPEED bz2 file extraction
Good, designed with parallelism in mind can be, theoretically, implemented as separate threads for each input part.







COMPRESSION RATIO bzip2 algorithm

Good, improved over Deflate but lacking behind modern compression algorithms employed in RAR and 7Z formats.

ADVANCED OPTIONS decompress bz2 file
BZ2 is meany only for providing single-file compression, lacks archiving and encryption features by design.






Create, open, extract BZ2 files


PeaZip offers full read / write support for BZ2 compressed files, through the Open Source components from 7-Zip and p7zip projects (released under LGPL license, as PeaZip) to offer the same GUI frontend to create, browse, and extract .bz2 files under Windows and Linux operating systems.

As alternative, 7-Zip (on MS Windows systems) and p7zip (on Linux/BSD), both free and Open Source tools, are recommended for working with bz file format.

Compress to BZ2 format

BZ2 accepts a single file as input, otherwise (to add multiple files and directories) use "TAR before" option to consolidate input in a single TAR package before proceeding with compression stage with BZip2 algorithm.

  • From the system's file explorer

    • Select files and folders and use context menu entry PeaZip, Add to archive: you will be prompted to archive creation screen, allowing to set compression settings, output destination, encryption (password protection), and other options.

  • From PeaZip

    • Select files and folders, and use Add button (or application's context menu entry of same name) to be prompted archive creation screen

    • Drag and drop files / folders from the system to a PeaZip instance

From main archive creation interface it is possible to split file - set creation of multiple volumes declaring the maximum output size (spanned archive), in order to keep the output size below mandatory limits (e.g. upload or mail attachment size).
From "Advanced" tab, you can fine-tune compression settings (dictionary size and passes) of the BZip2 compression.

From "Console" and "Schedule" tab, the compression / backup task created in the GUI can be saved as command line script and (on Microsoft Windows operating system) scheduled for execution at fixed time intervals (hour, day of the week or of the month) - same apply for extraction / restore tasks, as the same tabs are featured in archive extraction interface.

Convert BZ2 files


File converter procedure using Convert button extracts and then re-pack input archive files into any write-supported format (7z, arc, pea, tar, zip...), optionally keeping or discarding original archives.
This makes possible to convert any type supported for reading (e.g. ACE, CAB, RAR, TAR, ZIP...) into a new BZ2 file (which, however, accepts a single file as input), as well as to convert existing BZ2 file into another write-supported format.

Open and extract BZ2 file

Use one of the procedures described below to open (browse and search inside the archive) and/or decompress .7Z archives or .XZ files

  • From the system

    • To view archive's content, open it in PeaZip with double click (if file extension is associated with the application), or using system context menu "Open as archive" entry, that will attempt to read any user provided file type regardless file type associations - this option is also available in PeaZip's context menu

    • Use context menu entry "Extract..." for full extraction screen GUI where to set output path and other options

    • Select one or more archives and use context menu entry Extract here or Extract here (to new folder) for quick extraction with no further confirmation

  • Within PeaZip

    • Extract button shows full featured archive extraction screen providing access to all options (password, set output path, open output path after extraction, keep or delete original archives, etc) and can send to extraction selected items only

    • Extract all to... button activate a simplified procedure only asking for output path

    • Simply drag & drop desired objects from the application to the system

    • Doubleclick on an archived file to open it in preview mode, i.e. to inspect its content before considering the need for real extraction

BZIP2 files, read more


External online resources: BZip official domain7zip software domain, Burrows–Wheeler transformBZip2 compression entry on Wikipedia.

Topics and search suggestions: how to compress, convert, and extract Bzip2 files, unzip / unpack Bzip format, free BZ2 file opener and extractor wiki,  compression, handle, view, browse, explore, navigate, read .bz2 extension, open bz archives, manage and decompress data compressed with Bzip2 algorithm, download bz2 player / reader / viewer, bizp file manager utility.



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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.

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