All about KFX Files

The KFX file type is primarily associated with Kindle.

KFX	File extension: KFX
	File type:	e-book

What is a KFX file?

KFX files mostly belong to Kindle by Amazon. KFX is the filename extension of e-books stored in Kindle Format X (10) format for Kindle devices. A KFX file contains a DRM-protected e-book made up of text, formatting, layout, images, and metadata. Unlike previous Kindle formats such as AZW, KFX format supports enhanced typesetting, ligatures, kerning with additional font support. It also supports some HTML5 and CSS3 features used to improve the styling and layout of the pages in a document. Kindle for Android, iOS, and Windows can be used to read e-books saved in KFX file format. KFX filename extension is also used by image files saved in Kofax Group 4 format. These KFX files are typically used to store 56 x 60 pixel images captured with scanners and other imaging devices. A KFX image file contains graphics data, and the image's metadata including creation date, bit depth, resolution, and description.

How can I open a KFX file?

You need a suitable software like Kindle to open a KFX file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your KFX file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a KFX file directly in the browser:. Just drag the file onto this browser window and drop it.

Online KFX File Viewer

Choose your .kfx file to view this image

or drag and drop it here

Online File Viewer

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How to convert a KFX file to PDF, DOCX, EPUB, FB2, MOBI, TXT, ...

If you want to convert or edit a KFX file, you can use our free Online KFX File Converter (powered by Convert.Guru):

To do so, click the "Choose your .kfx file to view this image" button above.
Your KFX file will then be displayed in the browser.
Now click on "Save as..." at the top of the page.
Then choose the desired ebook format (e.g. PDF, EPUB, DOCX, FB2, MOBI, TXT, RTF, ...).
Download the converted file.

Programs that open and convert KFX files:

Kindle by Amazon
See the previous paragraphs to learn more about the main application. KFX files are often referred to as Kindle ebooks because this type of file is primarily created or used by this software.
Calibre (e-book) by Calibre Community
Calibre is an open source, e-book reader that supports most electronic document formats including PDF, EPUB, MOBI, and KFX. Calibre can also be used to convert e-books to various formats. This file format is classified as eBook. Related links: Kindle File Format
XnView (bitmap) by XnSoft
XnView is a versatile image manipulation software for desktop environments. You can edit, view, or convert images stored in most 2D graphics formats including KFX with XnView. This file format is classified as Raster Image. Related links: XnView

KFX file extension format:

A file format defines how the data in the file is structured. The first characters in a file identify the file format, for example, HTML files start with the bytes <html>. If the file extension or signature does not match the file format, errors will occur when opening or editing the file. Knowledge is power - this also applies when dealing with unknown or faulty files. Below you will find our evaluation of the KFX files:

The KFX file extension is rather rarely used and mainly uses a defined KFX format. The two most popular formats are as follows:

65% of all KFX files use the same file format, which can be identified by the letters "êDRMIONîà" at the beginning. These are binary files, so they do not contain words or text. The file size is in the range of 33 KB to 1 MB. The file type is relatively new. The files contain the following words: DRMION, ProtectedData, AES/CBC/PKCS5Padding, amzn1, drm-key and drm-voucher. Such files are related to edition, english, spanish, book, sconosciuto, portuguese, trilogy, french, sample, guide and star.
30% of all KFX files start with the magic bytes CONT, which are always the first bytes of this file format. They consist of illegible, cryptic characters. A typical file size is 1 MB. The following keywords are characteristic: CONT. The file name metadata.kfx is typical for these files.

The remaining 5% of all KFX files are different files with different signatures. These files are often connected to magmax. Drag & drop your file here to see the file format and a preview of your KFX file!

Technical Data for KFX File Extension

File classification:

eBook

Related files:

azw, kfx-zip, voucher, xfx, yjr, phl, yjf, md, kfs, res, krx, ktx, kdf, ifo, epub, jpg, pdf, mobi, azw3

Related links:

Kindle File Format

Mime type:

application/vnd.amazon.mobi8-ebook

The following listing is compiled from the database produced by the 'Associate This!' program, selected data from the main FILExt database and file extension information submitted by users.

ProgramID: GraphicsConverterPro.kfx, FileType: Kofax Group 4, AppName: GraphicsConverter-reg
EXEFile: GraphicsConverter.exe

ProgramID: PaintShopPro8.Image, FileType: Paint Shop Pro 8 Image, AppName: Paint Shop Pro 8
EXEFile: Paint Shop Pro.exe

ProgramID: PaintShopPro8.Image, FileType: Paint Shop Pro Image, AppName: Paint Shop Pro 8
EXEFile: Paint Shop Pro.exe

ProgramID: PaintShopPro8.Image
EXEFile: %ProgramFiles%\Jasc Software Inc\Paint Shop Pro 8\Paint Shop Pro.exe /dde

ProgramID: PaintShopPro9.Image
EXEFile: %ProgramFiles%\Jasc Software Inc\Paint Shop Pro 9\Paint Shop Pro 9.exe /dde

ProgramID: XnView.Image
EXEFile: %ProgramFiles%\XnView\xnview.exe %1

ProgramID: PaintShopProX.Image
EXEFile: %ProgramFiles%\Corel\Corel Paint Shop Pro X\Paint Shop Pro X.exe

ProgramID: SnapfireI.Image
EXEFile: %ProgramFiles%\Corel\Corel Snapfire Plus\Corel Snapfire.exe

ProgramID: Pagis.Image
EXEFile: %ProgramFiles%\ScanSoft\Pagis\XIFVIEW.EXE

ProgramID: Pagis.Image
EXEFile: %ProgramFiles%\Xerox\Pagis\XIFVIEW.EXE

Show all 10 listings To Top

a kfx e-book is a special file format by Amazon and should only be edited and saved with the appropriate software.

How to solve problems with KFX files

Associate the KFX file extension with the correct application.
Update your software that should actually open e-books. Because only the current version supports the latest KFX file format. Search, therefore, e.g. on the Amazon manufacturer website after an available Kindle update.
To make sure that your KFX file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
Click here to open your .KFX file online - secure, fast, and no downloads needed.