Currently, it supports converting from Babylon glossaries, Freedict dictionaries, Sdictionary dictionaries and Stardict dictionaries to DICT dictionaries, plain text dictionaries and StarDict dictionaries. More file types will be added in new versions.
When converting to StarDict and DICT, the .dict file is not compressed. This feature will be added in future. If you want to compress this file, use dictzip program:

The program detects the type of dictionary by its extension:
.bgl for Babylon glossaries
.dct for Sdictionary dictionaries.
.dic for plain text dictionaries
.ifo for StarDict dictionaries
.index for DICT dictionaries
.tei for Freedict dictionaries (XML format)