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I want to generate KF8 without going through the conversion process (My Content --> Epub/Html --> KindleGen/Calibre/Other tool), as I need more control over kf8 file generation. The guidelines document & the format overview can't fulfill the need for specifications.
Are official KF8 file format specs available? Although I have found some information on links such as http://wiki.mobileread.com/wiki/KF8#The_Format, but want to avoid relying on unofficial/reverse-engineered stuff.
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Kindle Package Format (KPF) is a variant of KFX. On Kindle Direct Publishing's support page, they recommend using KPF for your eBook. In 2021, Amazon began recommending EPUB instead of MOBI. In 2022, Amazon discontinued the use of the MOBI.
AZW3, also known as Kindle Format 8 (KF8), is the modified version of the AZW ebook digital file format developed for Amazon Kindle devices. The format is an enhancement to older AZW files and is used on Kindle Fire devices only with backward compatibility for the ancestor file format i.e. MOBI and AZW.
Kindle devices and apps are designed to use Amazon's e-book formats: AZW that is based on Mobipocket; in fourth generation and later Kindles, AZW3, also called KF8; and in seventh generation and later Kindles, KFX. Kindles now support the EPUB file format used by many other e-book readers.
Unfortunatelly, Amazon hasn't released a complete spec, only the docs you pointed out.
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