Quote:
Originally Posted by Quoth
Amazon's reasons for KFX rather than azw3/KF8- DRM even if Author / Publisher asked for DRM free (in that case any authorised Kindle that supports KFX works)
- Ability to start reading the ebook while downloading via whispernet.
- More kinds of DRM
- More kinds of print replica / PDF like content. Proper AZW3/KF8 is basically similar to epub2.
- Needed for markup / Sticky notes on Scribe.
The visual advantages seem marginal. So unless you are using a Scribe converting to AZW3/KF8 is best as it's also difficult to create KFX without Amazon tools and thus very awkward on Linux. Only 4 old Kindles don't support AZW3. More don't support KFX.
I use AZW3 to test before uploading epub2 to Amazon to publish. Most fiction is now uploaded as epub2, though docx and doc are accepted (but not as good).
I also only buy Amazon ebooks that will download without KFX or fixed layout mobi/azw, most are AZW3/KF8, but some very old titles (very few) download to PC as mobi/KF7.
My "master" format in Calibre is epub. Master source is odt, with an extra temp docx for calibre import.
PDF only for upload to POD, or if the document arrived as PDF. Only paper or clay tablets are worse to convert.a
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Also if you are converting some fixed-layout ePub or PDF or CBZ comic or manga, you can generate a KFX with guided view using
Kindle Create and
KFX Output plugin. Fixed layout ePub seems to get converted well by Send To Kindle to a KFX document, but obviously it will not have guided view.
In such a case one might well want to store KFX for side-loading (as well as the source).