The Previewer can be used to perform conversions in spite of it producing numerous "DEBUG" and "fixme" messages. The Linux platform is not supported by the Kindle Previewer, however the Windows version can be installed under Wine. Versions newer than 3.71 have not been tested and might not be compatible.) (Versions below 3.38 are not compatible with this plugin. Version 3.71 (Jan 17, 2023) is recommended for best results. Install it while signed in to the same user account that you use to run calibre. If given a choice of installation location choose the default. It is available from for Windows and MacOS. In order for the plugin to function Amazon's Kindle Previewer 3 must be installed. KPF can be produced by Kindle Previewer 3 and Kindle Create. The main components are a descriptive KCB file in JSON format and a KDF file containing the main book content in an SQLITE database. KPF (Kindle Package Format) is a ZIP archive. The plugin instead generates an equivalent unencrypted monolithic KFX file, which is supported by Amazon reading apps and devices when sideloaded.Ī more in-depth discussion of the KFX format can be found in the KFX Format thread, the MobileRead Wiki (KFX), and the KDP help pages. KFX books delivered by Amazon are a bundle of files composed of an encrypted main container, a metadata container, auxiliary containers (zero or more) and a DRM voucher. Repackage the KPF data into a KFX container.Use the Amazon Kindle Previewer 3 command-line interface to convert from EPUB to KPF.Correct some common EPUB content issues that cause problems for the Previewer.Convert from the original e-book format to EPUB.The plugin performs the following steps during conversion: This plugin is able to invoke the Previewer for conversion and reformat its output from KPF to produce KFX files suitable for sideloading. It does this by converting the EPUB file to KPF, which has the same content as KFX but in a different container. Amazon does not provide a way for Kindle users to convert their own books to KFX format.Īmazon Kindle Previewer 3 is software that takes books in EPUB format and renders them with Enhanced Typesetting. Only e-books in the proprietary KFX format support these features and currently only Amazon sourced e-books downloaded directly from Amazon to apps and devices are available in this format. Page Flip, improved manga experience (fast continuous page turns, pan/zoom, crop margins, page spreads), and Guided View for comics provide improved navigation within a book's contents. Enhanced Typesetting is required for the correct rendering of books in Arabic, Hindi, Gujarati, Marathi, Malayalam, Tamil, and Traditional Chinese. Enhanced Typesetting allows improved rendering of e-book content using hyphenation, kerning and ligatures. The same effect can be achieved in older versions of calibre using the Hyphenate This! plugin.)Īmazon has added support for several advanced features in newer kindle reading apps and firmware. It is less difficult to use and the book format it works with is compatible with more devices and software. (Note: If you only want somewhat better typography when reading Kindle books then using the "Add soft hyphens" option of the "Polish books" command in calibre version 4.6 or higher should be considered as an alternative to using KFX. Amazon converts personal documents delivered to a Kindle Scribe using send-to-kindle to KFX format so that the sticky note annotation feature will function. Kindle Scribe owners do not need to use this plugin. This allows books obtained from sources other than Amazon to be read with Enhanced Typesetting, multi-thumbnail Page Flip, non-justified alignment, continuous scrolling, page curl, Guided View for comics, and sticky notes (on Kindle Scribe). The purpose of the KFX Output plugin is to convert e-books into KFX files that can be sideloaded to newer Kindle apps and devices. #1 jhowell 03-26-2016, 01:42 PM KFX Conversion Output Plugin
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