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Old 11-11-2023, 08:51 AM   #5
jhowell
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Posts: 7,121
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Join Date: Nov 2011
Location: Charlottesville, VA
Device: Kindles
These days Amazon makes a sharp distinction between the e-book formats that they accept from publishers and the formats that they deliver to customer apps and devices.

Professional publishers deliver their books to Amazon in EPUB format and Amazon produces a growing set of Kindle-specific formats from that. These days most customers see KFX format on their devices. In coming years something else may replace that just as KFX replaced KF8 and KF8 replaced MOBI as the dominant Kindle format. So the real question is not what software publishers use to produce AZW format, but that do they use to produce EPUB format.

Although EPUB has become the somewhat universal e-book publishing format there are still differences in the level of support for specific EPUB features and proprietary EPUB extensions available on different reading platforms. Knowing the often undocumented details of these is one thing that separates professional e-book formatters and publishers from the amateurs.
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