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tomsem · 09-02-2024, 12:29 AM

I've not had many issues with converting AZW3 to ePub with calibre. Exception is for fixed layout (images + text) books, then KindleUnpack does better (calibre does not support fixed layout ePub).

For image only books (comics, manga), the ePub KindleUnpack (at least for some books) generates leaves a couple of issues that calibre Edit book complains about (no ToC, item in spine without a target, some CSS issue), but even after fixing these issues, there are issues rendering pages properly (in particular 2 page spreads are not handled correctly).

If I get a KFX with Kindle for PC, import that and convert to fixed layout ePub with From KFX, then the spreads are rendered properly. Edit book shows no errors, and they render properly in Thorium and Apple Books.

Ideally KindleUnpack would work as well, as getting decoded KFX may not remain possible. I will see if I can figure out what the issues are and report them to @DiapDealer.

Unfortunately I have a number of these in my library and only in last few months realized calibre's conversion to ePub wasn't good. So I have to hunt them all down and fix them.

It might be nice if one could configure calibre to avoid attempting to convert fixed layout AZW3.

09-02-2024, 12:29 AM	#4
tomsem Grand Sorcerer Posts: 6,944 Karma: 27060153 Join Date: Apr 2009 Location: USA Device: iPhone 15PM, Kindle Scribe, iPad mini 6, PocketBook InkPad Color 3	I've not had many issues with converting AZW3 to ePub with calibre. Exception is for fixed layout (images + text) books, then KindleUnpack does better (calibre does not support fixed layout ePub). For image only books (comics, manga), the ePub KindleUnpack (at least for some books) generates leaves a couple of issues that calibre Edit book complains about (no ToC, item in spine without a target, some CSS issue), but even after fixing these issues, there are issues rendering pages properly (in particular 2 page spreads are not handled correctly). If I get a KFX with Kindle for PC, import that and convert to fixed layout ePub with From KFX, then the spreads are rendered properly. Edit book shows no errors, and they render properly in Thorium and Apple Books. Ideally KindleUnpack would work as well, as getting decoded KFX may not remain possible. I will see if I can figure out what the issues are and report them to @DiapDealer. Unfortunately I have a number of these in my library and only in last few months realized calibre's conversion to ePub wasn't good. So I have to hunt them all down and fix them. It might be nice if one could configure calibre to avoid attempting to convert fixed layout AZW3. Last edited by tomsem; 09-02-2024 at 10:22 AM.