Thread: Make an EPUB2 into an EPUB3
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Old 11-27-2020, 06:16 AM   #12
davidfor
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Quote:
Originally Posted by Winnito View Post
I'm not really sure that I understand the importance of NCX TOC (I'm a kindle user so maybe I should)....but how terrible is the idea of simply batch converting/upgrading all my epubs into epub3. Tnx
The NCX ToC is an ePub2 requirement for navigation. In ePub3, this has changed to something else. But, ePub3 is largely backwards compatible with ePub2 and can be read using a reading app or device that does not understand ePub3. But, if the NCX does not exist, these apps/devices may not be able to open the books. Or, if they can, will not be to navigate through the book. You will probably be able to read from the start to end of the book, but won't be able to skip to another chapter.

What you do depends on the purpose of the library and how you read the books. If this is your personal library and you will only ever use a Kindle for reading, it doesn't matter. Either can be converted to the Kindle format. If you read with something else, then you need to work out what formats they use. If you share the library, then you need to consider what they use to read with.

Personally, I don't think there is any reason to do a batch conversion to ePub3. About the only reason I would do it is if were going to change to an ePub3 only app or device (I have never heard of one) or one that had a clear advantage for using ePub3. If you are doing a conversion to ePub for some other reason, then it probably won't harm to use ePub3. But, at this point, I would be retaining the NCX for the backwards compatibility.
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