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The main purpose of conversion to KF8 (AZW3) format in calibre is so that the resulting file can be sideloaded to Kindle devices for reading. KF8 is a good format for that purpose because it is more functional than the older MOBI format and is supported by almost all Kindle apps and devices.
The Kindle Previewer is a tool for publishers. Its primary purpose to to convert from the primary e-book intake format (EPUB) to Amazon's latest format used by newer Kindles (KFX) and display the results so that problems can be found and corrected.
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