.KFX File Extension

2 file types use the .kfx file extension.

Amazon KF10 eBook File

Developer Amazon
3.3  |  15 Votes

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.

Open over 400 file formats with File Viewer Plus.Free Download

Programs that open KFX files


Kofax Image File

Developer Kofax
3.7  |  3 Votes

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


Verified by FileInfo.com

The FileInfo.com team has independently researched all file formats and software programs listed on this page. Our goal is 100% accuracy and we only publish information about file types that we have verified.

If you would like to suggest any additions or updates to this page, please let us know.