Well, theoretically you can simply decompress JAR files using Java, and then repack the content to a ZIP archive and this will achieve jar to zip conversion. It is possible, however the reasons for this conversion (repacking) are somewhat questionable.
Home > Search converters: jar to zip
Conversion of jar file format to zip file format beta
Search for jar to zip converter or software able to handle these file types.
Convert Compressed archive file package for Java classes and data to Compressed ZIP archive.
We have found 3 software records in our database eligible for .jar to .zip file format conversion.
Microsoft Windows software 
- convert jar to zip 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 zip file | No | No | 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 zip. 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 zip on OS X
iPack
A full-featured compressed archives manager
Additional links: Open jar file, Open zip file
JAR
Files with jar extension are compressed archives, typically used for content in Java and distribution/installation purposes.
ZIP
Files with zip is associated with the WinZip compression tool. ZIP file is compressed archive container that contains archived files, compressed in ZIP compression format. Common archive format that can be extracted with any archiving tool.
Back to conversion search
