Considering that both JAR and RAR files are compressed archives, you can freely repack the contents as you like. You can also further compress .jar file to produce .rar file, but that's not actually jar to rar conversion in proper sense.
Home > Search converters: jar to rar
Conversion of jar file format to rar file format beta
Search for jar to rar converter or software able to handle these file types.
Convert Compressed archive file package for Java classes and data to WinRAR RAR compressed archive.
We have found 3 software records in our database eligible for .jar to .rar file format conversion.
Microsoft Windows software 
- convert jar to rar on Windows
7-zip
Popular open source file archiver with a high compression ratio
File extension | Convert | Open | Save | Edit | Create | Import | Export | Extract |
|---|---|---|---|---|---|---|---|---|
Convert from jar file | No | Yes | No | jar editor | Yes | No | No | Yes |
to rar file | No | Yes | No | No | Yes | No | No | Yes |
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned jar to rar. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
FilZip
A freeware file compression tool
Apple macOS / Mac OS X software 
- convert jar to rar on OS X
iPack
A full-featured compressed archives manager
Additional links: Open jar file, Open rar file
JAR
Files with jar extension are compressed archives, typically used for content in Java and distribution/installation purposes.
RAR
Files with rar extension are compressed archives using RAR or WinRAR compression utilities. Along with the ZIP format, the RAR format is one of the most common formats used and can be extracted by almost every archiving tool.
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