Calibre can make two kinds of Mobi
1) Old Mobi. KF7, there are no embedded fonts. Though there are KF7 with embedded fonts?
2) Dual Mobi. Only good for Smashwords or other non-Amazon kindle distribution. It's got the Old Mobi KF7 and the Azw KF8 in one file. It will embed fonts if you ticked the embed fonts when you made an epub2 from a docx.
Calibre can make two sorts of epub.
3) epub2.
4) epub3. Do not use epub3 unless you know you need it (notice in Calibre).
Calibre can make azw KF8 too.
There are plugins for KFX and kepub.
Always start by importing a docx to Calibre and convert it with embedded fonts to epub2. Make all other formats from the epub2.
You shouldn't upload azw or dual mobi to Amazon and uploading old mobi is pointless, though it works. Best to upload is epub2. 2nd best is a docx.
Last edited by Quoth; 10-21-2020 at 02:12 PM.
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