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FAQ / TIPS & TRICKS > HOW TO CREATE RAR FILES
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Compress data to RAR archive file



RAR FILE COMPRESSION TOOLS

HOW TO USE RAR COMPRESSOR

MORE ABOUT RAR COMPRESSION

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RAR is a popular data archival and compression format introduced for WinRAR (Eugene Roshal, 1995), a file archiver utility released for MS Windows operating systems only.
RAR compression is based on Lempel-Ziv LZSS and prediction by partial matching PPMd/PPMII (Dmitry Shkarin), which provides very good compression ratio, almost comparable with 7Z.
The format also features data recovery capabilities (if optional recovery records are used while creating the archive), and optional AES based encryption.
"RAR" acronym stands for "Roshal ARchive", from the surname of the author.

PeaZip, freeware and open source archiver utility, can open and extract RAR files on Linux and Windows, using the Open Source code written by Igor Pavlov in 7-Zipfree rar file archiver and its POSIX port p7zip project.

No Open Source free RAR archiver utility is available: UNRAR is available as royalty-free and open source software for allowing extraction of RAR archives both on Linux and Microsoft Windows, but with the clause of not reverse engineering the code for implementing RAR compression which prevents creation of royalty free rar archivers & compressors.

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The non reverse engineering clause about the RAR compression algorithm and code apply as well for any rewritten version, so no Free Software, royalty free RAR archiver and compressor can be created under current licensing terms.

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Consequently, due to RAR's license constrains, no free software can be written to be natively capable of writing RAR archives (which is required both for RAR archive creation, update and repairing), unless calling Windows-only WinRar's executables (i.e. rar.exe), that requires having WinRar (shareware, free for 40 days only) downloaded and installed as a separate product.
Please note that WinRar license's time trial legal limitations apply to any part of the package (as i.e. rar.exe) as well, even if it does not display the warning screen as the main WinRar's GUI executable.

How to use RAR compressor


Archive format dropdown menu in PeaZip compression screen allows to select "Custom" format, which lets the user select an arbitrary compressor executable, enter command parameters for it, and to customize the syntax of the generated script string in order to adapt to the syntax the compressor is expecting.

With WinRar installed in the system (as there is no third parts tool capable of rar compression due rar format licensing restrictions), you can set PeaZip's "Custom" archive type interface to use rar.exe to create a RAR archive through PeaZip's GUI.

rar syntax


Set compression to Custom format
Chose "Custom" format in compression dialog.
Following steps will only be needed the first time you set RAR as custom compression formats (or if you change custom compressor)
, afterwards settings will be remembered and you can select RAR format simply chosing "Custom" compression.

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Select RarLabs rar.exe path

Go to "Advanced" tab to tell PeaZip how to use rar command.
F
irst information needed is where the rar.exe executable is saved in your system.
Usually, it is in C:\Program Files\WinRAR\Rar.exe or
C:\Program Files (x86)\WinRAR\Rar.exe
Use the file dialog on the right of
"Executable" field to pick the file.

rar command line


Configure rar command line parameters

Write "a" in "Parameters" filed, which stands for "create archive" command for rar.exe syntax
In "Syntax" dropdown menu it should already be selected the second entry of the list: "parameters, output, input", in this way rar.exe will be able to parse PeaZip's frontend commands in the correct order.
More about RAR compression

External online resources: RarLabs WinRARrar file compression software official domain, Lempel-Ziv LZSSLempel Ziv compression and prediction by partial matchingPPM compression PPMd/PPMII Wikipedia entries.

Topics and serach suggestions: create rar archives, compress data to RAR file format, free rar archiver licensing issues, Roshal Archive format intellectual property, freeware RAR utilities, rar compression algorithm, add files to .RAR package, WinRar archiving function, RarLabs tools, how to rar wiki, rar compressor tool.


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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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