Monolithic KFX can also be produced using the KFX Output plugin. See "Importing KFX books into calibre" below for instructions. This plugin will combine the individual files that make up a KFX book into a single file (monolithic KFX format) when a KFX book is successfully imported into calibre.
KFX container files typically have a ".kfx" extension, though other extensions (".azw", ".azw8", and ".azw9") are used by some software. Those each contain only part of the book's content and cannot be converted individually. See the thread Dealing with Kindle for PC/Mac 1.19 and KFX in calibre for details.īooks in KFX format 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. Some cases where KF8 is not available are Arabic, Indian and Traditional Chinese language books/dictionaries, books produced using Kindle Create, Kindle in Motion books with animation, Interactive Textbooks with A/V media, and some newer eTextbooks. This plugin has limited usefulness as long as KF8 is still easily obtainable. More information about the KFX format can be found in the KFX Format thread and the MobileRead Wiki (KFX).Īmazon's KF8 (azw3) format is superior to KFX as a source for conversion since it more closely matches the original format provided to Amazon by the publisher. It supports advanced features, including Enhanced Typesetting and Page Flip, on Amazon apps and devices. The plugin can convert from several KFX variants: Monolithic KFX, KFX-ZIP, or KPF.Īmazon uses KFX format for the delivery of most e-books to customers. The KFX Input plugin allows books in Amazon KFX format to be imported and converted to other e-book formats, such as EPUB, for archival and for reading on alternate devices.
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