Zip Imploder is a full featured zip program for zipping and unzipping files to and from zip files. Zip Imploder is also capable of Imploding Zip files, something that no other zip program does.

Imploding basically deletes all the files in a folder that are already inside the zip file, sort of "undoing" the unzip process, but doing so intelligently by comparing file size, date, and time so that modified files are not deleted.