J file extension

JAR archive

Run a free instant scan for .J file errors

A .J file is known as a JAR archive.

This file extension was added to our database by a visitor to this site, but no further information was provided. We have yet to investigate the J file extension any further, or there was simply not enough information available at the time to report accurately on this format.

However, it is possible that other file formats exist that use the J extension, so please let us know if you do not think this extension matches the file format you are looking for.