Thread: What is "iBooks format"?
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Old 06-10-2020, 12:11 PM   #8
JSWolf
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Quote:
Originally Posted by Doitsu View Post
If your epub2 book passes EPUBCheck, you don't have to convert it, but you can convert it to an epub3 book with the ePub3-itizer Sigil plugin to take advantage of the epub3 features that Apple Books/iBooks supports.

Edit: In Calibre, you can also select Polish > Upgrade Book Internals.

For more information on formatting books for Apple Books/iBooks, see the Apple Books Asset Guide 5.2.11.
But if converting to ePub 3 would add nothing to the ePub in Books, just leave it as an ePub 2.
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