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Originally Posted by Austruck
Strange that so many of the books I've purchased through Amazon (from big publishers and indie authors) have been in .azw3 format.
I chose that over .mobi because the .mobi conversion was giving me an extra blank page or two between chapters.
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Correct. kindlegen creates a "dual-MOBI" which contains an AZW3 section and a MOBI section.
Amazon demands a MOBI section at a minimum, in order to support old devices.
I am pretty sure you can upload *just* a MOBI and they will accept it (to stay compatible with mobipocket creator), but if you want AZW3 as well...
The dual-format file will be split by Amazon and they will only send AZW3 if your device supports AZW3 (but if your device only supports MOBI, they will send the MOBI).
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I'm unsure how Amazon could tell if I've created a file through Calibre. Plus, all four of my own books for sale on Amazon were created via Calibre, with no issues from Amazon. Same with most of my author friends.
Will check out Kindlegen. Thanks for the tip! Publishing's like navigating hostile waters sometimes!
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calibre has a unique conversion style.
Plus it leaves "creator" metadata.
Anyway, the reports are inconsistent, and IIRC plain MOBI was always OK even if calibre created it.
But plain MOBI is legacy garbage.