The program has been localized to more than twenty languages.

FilZip fully supports seven different archive formats, allowing the user to add and extract files from the archives. These include ZIP, BH, CAB, JAR, LHA (LZH), TAR, and gzip. A handful of other formats are supported for extraction only, including ACE, ARC, ARJ, RAR, and ZOO.

Files within most formats can be viewed without explicitly unpacking them, and can be removed or renamed within the archive. ZIP files may be spanned; that is, written to any number of files with a fixed maximum size so that they can be placed on removable media.

The program has good shell integration, and can create self-extracting executable archives for redistribution without licensing fees.