Quote:
Originally Posted by Aleron Ives
The extension will always be .epub, but the book will usually be a KEPUB file. It doesn't matter either way, since as Quoth said, the extra Kobo spans will be ignored by regular EPUB readers. An easy way to check is to run the book through kepubify: if the file size doesn't change, the book was already in KEPUB format.
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Use Modify ePub to remove the KePub code. Then it will be a plain ePub. You then have it as ePub. ePub is a better format for keeping a copy of your eBook. Then you can convert it back to KePub if you want to read it that way on your Kobo.