There are eight main usage scenarios:
List all Unicode characters used in an EPUB file or a plain text UTF-8 file.
List all Unicode glyphs present in a TTF/OTF/WOFF font file.
Check whether a given font file contains all the glyphs needed to properly display the given EPUB or plain text file.
Minimize a given font file, that is, create a new font file containing only the subset of glyphs of a given font that are contained in a EPUB or plain text file.
Convert a font file from/to TTF/OTF/WOFF format.
Export one of the above lists of Unicode characters as an EPUB file, for quick testing on an eReader.
Lookup for information about a given Unicode character, including fuzzy name matching.
Count the number of characters in an EPUB file or a plain text UTF-8 file.