Kindle Previewer version 3.32 and KPF

Amazon has released version 3.32 of the Kindle Previewer. The major change is the introduction of a command line interface that can convert source files into KPF format. It also supports batch conversion of multiple files at once. Once a book is in KPF format it can be viewed with the Previewer GUI or uploaded to Amazon for publishing.

This provides a new possible workflow for publishers. It will be interesting to see if there are any differences in the resulting Kindle book if it is published using a Previewer generated KPF instead of a Master MOBI from kindlegen or a source format such as EPUB or MS Word.

KPF (Kindle Package Format) is a variant of KFX, the format that enables Enhanced Typesetting. Amazon's Kindle Create and Kindle Textbook Creator software have produced this format for some time. The KFX Output plugin for calibre is capable of converting KPF format into KFX that can be sideloaded to kindle apps and devices, a feature that Amazon does not currently provide.

Quote:

Usage instructions: kindlepreviewer <input> <-command(s)> [-option(s)]

Input: Specify the input file name here when processing a single file, or the input folder when processing multiple files.
Command(s): Include at least one of the commands specified in this table:
- -convert
  Create a KPF file in the specified output path or a Mobi file if the book doesnt support Enhanced Typesetting. Use the Enhanced Typesetting-compatible KPF file to open the book in Kindle Previewer's graphical user interface.
- -showpreview
  Open the converted book in Kindle Previewer's graphical user interface. This will first convert the book, and then open it for preview.
- -log
  Use this option to generate only the log files for validation without generating a KPF or a Mobi file.
Option(s): Choose any of options specified in this table (optional):
- -output <output path>
  Path to the output folder. Use this option to specify a preferred path to store output file(s) instead of the default path (input folder).
- -locale <locale-option>
  Specify your preferred locale. Use this option to set the language for conversion log messages and the Kindle Previewer user interface. Supported locales:
  - en (English)
  - de (German)
  - fr (French)
  - it (Italian)
  - es (Spanish)
  - zh (Chinese)
  - ja (Japanese)
  - pt (Portuguese)
  - nl (Dutch)