.KFX File Extension

.KFX File Extension

2 file types use the .kfx file extension.
File Type 1

Amazon KF10 eBook File

Developer Amazon
Popularity
3.5  |  10 Votes
Category eBook Files
Format Binary

What is a KFX file?

A KFX file is an eBook created in the Kindle Format 10 (KF10), Amazon's successor to the .AZW3 (Kindle 8) format. It contains an Amazon eBook, which includes the text and metadata describing the book, such as the author, title, and number of pages. KFX files support enhanced typesetting capabilities that are not provided in previous formats, such as hyphenation, improved character placement and word spacing, and a more adaptable page layout and margins.

More Information
Screenshot of a .kfx file in Kindle for Mac 1.2
KFX file open in Kindle for Mac 1.2

eBooks may be saved in one of several formats. The format of an eBook downloaded from the Amazon store depends on the device being used to download and read the eBook. It may be saved in the KFX format or in the .MOBI, .AZW, or .AZW3 formats.

To open and view eBooks saved in the KFX format, Amazon provides a Kindle app for Windows, macOS, Android, and iOS. You can also use Calibre, a popular program for managing and opening various eBook formats.

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Programs that open KFX files

Windows
Linux
iOS
Android
Updated September 19, 2017
File Type 2

Kofax Image File

Developer Kofax
Popularity
3.7  |  3 Votes
Category Raster Image Files
Format Binary

What is a KFX file?

Raster image created by Kofax scanning and imaging software products; contains a graphic formatted as a Kofax Group 4 image; contains a 128 byte header, which includes information about the image size, date created, date modified, bit depth, and resolution; also contains a description text field.

Programs that open KFX files

Windows
GraphicsConverter
Mac
Updated May 13, 2010

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