Quote:
Originally Posted by 8140david
This makes it easy to select which characters to include when trimming a font. 
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Another option if you also happen to be a calibre user, the calibre epub/azw3 Editor has an option to subset any embedded fonts (i.e. auto-remove unused characters). The same option is also included in the calibre Polish feature (
that's Polish as in "shine" not Polish the language BTW) if you want to font subset many epub/azw3 books in one go.