Thread: Amazon's own ebook format
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Old 01-03-2014, 04:32 AM   #48
pdurrant
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Quote:
Originally Posted by jgsmith View Post
I thought that KF8 == AZW3 (can you tell I'm in IT?) and that converting from KF8/AZW3 to ePub was not so much a conversion as an unpack that removed an Amazon wrapper. Is this wrong?
KF8 and AZW3 are indeed different names for the same format. KF8 (Kindle Format 8) is what Amazon calls it, AZW3 is the file name extension Amazon sometimes gives to books in KF8.

However, KF8 is not just a different way to package an ePub from a KF8 file. The specifications for what is valid HTML and CSS is different (similar, but different) for KF8 and ePub.

KindleUnpack can create something that looks like an ePub, but it still has the HTML and CSS appropriate for KF8, not ePub. It might or might not be valid for an ePub. And the ePub structure has been created by KindleUnpack. It wasn't present in the KF8 file.

This is in stark contrast to Amazon's AZW4 format, which really is a PDF in a new wrapper, and from which a valid PDF can be extracted by KindleUnpack.
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