We work hard to make sure that all of our supported file formats are compatible with major ebook distributors and print-on-demand services.
This includes: Kindle, IngramSpark, iBooks, Nook, Kobo, and more.
All fonts which were embedded in the stylesheet for your theme will be included in your files when they are exported and uploaded to your distributor's system.
It is possible, however, for a user to accidentally introduce content to a book that will prevent the file from validating. We recommend turning on the validation error notifications for your books by following the steps in our user guide: https://guide.pressbooks.com/chapter/export-validation-logs/
Some distributors may also require crop marks or specific margin dimensions and font sizes. You can change these settings by going to Appearance > Theme Options from the left sidebar menu.