Conversion of jar files to rar file format

Both JAR and RAR formats are used for compressed archives, which means it should be possible to freely repack the contents between formats as you like. You can even further compress JAR file to make RAR file, however that is actually not  jar to rar conversion and it is unlikely the file size will be reduced much.

Open JAR file    Open RAR file

Related software

7-zip icon

7-zip

Popular open source file archiver with a high compression ratio

FilZip

A freeware file compression tool

iPack icon

iPack

A full-featured compressed archives manager