You mean for ePub files, Jane? Other than PDF I don't think any other formats can have embedded fonts. Someone can correct me if I'm wrong.
If you do mean ePub, and since you're the author of the books, there's an easy way if you have the original text (RTF, DOC, etc.). Just load into the Atlantis word processor, tweak as necessary, and click the check box for "embed fonts" when saving the ePub. (Note: Atlantis is not free, it's $35 with a month of free trial.)
For an existing ePub, take a look at Sigil. The forum is just below this one. Good luck!
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