Best 4 KFX Converter

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Since Amazon adopts the latest KFX as their main encrypted books format, more and more users are in desperate need of converting KFX books in order to get rid of the DRM protection and read Kindle books on other wonderful e-ink devices and reader apps. With the popularity of KFX format, many software companies also start to develop the best KFX converter to remove KFX DRM and convert KFX to other common formats supported by the majority of devices and apps. So here we have picked the best 4 KFX converter for you.

No.1 -- Epubor Ultimate

Epubor software is well-known brand dedicated to satisfying customers' needs with the best DRM Removal and Converter. And its star software -- Epubor Ultimate is the bestseller in this business. Epubor Ultimate is the best eBook DRM Removal plus eBook Converter. You can never find such an awesome software with so easy to use and intuitive interface. Below are the tutorial guide about how to convert KFX with Epubor Ultimate.

Step 1download Epubor Ultimate to your computer and launch it.

Download Epubor Ultimate for Free

Step 2download KFX books to your computer with an older version Kindle for PC/Mac.


1. One cool thing about Epubor Ultimate is that it can automatically detect your KFX books that are downloaded via Kindle for PC/Mac in the left sidebar under Kindle column.

2. Downgrading Kindle app to an older version is required to make Epubor Ultimate work.

Step 3add the KFX books from the left side-bar to the right main window to remove DRM.

epubor decrypt kfx

Step 4choose PDF/Epub/Mobi/TXT/AZW3 as the output format and click Convert to PDF/Epub/Mobi/TXT/AZW3 to start the conversion.

epubor kfx to pdf

Bonus tip:

Epubor Ultimate can’t remove KFX DRM if the Kindle books are downloaded from v1.25 or above Kindle desktop app. Downgrading your Kindle app to an older version is required to make Epubor Ultimate work smoothly. And if you are using the latest macOS 10.15 Catalina, Epubor KCR Converter is the only solution for you to export your Kindle books from Kindle Cloud Reader as drm free ePub/AZW3/Mobi/PDF/TXT files directly.

convert kindle cloud reader to mobi

No.2 -- Calibre

Calibre is a powerful and easy to use e-book manager. Besides this, it's also an outstanding ebook converter and ebook reader. It's definitely a must-have for ebook enthusiasts. What's more, now Calibre can even decrypt ebooks with DeDRM plugin, including the latest KFX books. Below are the tutorial guide about how to convert KFX with Calibre.

Step 1download Calibre to your computer and launch it.

Step 2download DeDRM Plugin to your computer and unzip it.

Step 3load DeDRM Plugin to Calibre.

Open calibre's Preferences dialog. Click on the Plugins button. Next, click on the Load plugin from file button.

calibre plugin load dedrm tool

Navigate to the unzipped DeDRM_tools folder and, in the folder DeDRM_calibre_plugin, find the file DeDRM_plugin.zip. Select the file and click Open.

dedrm calibre plugin1 dedrm plugin zip

Step 4add Kindle KFX books to Calibre by clicking Add books in the tool bar.

You need to download KFX books via Kindle for PC/Mac or Kindle e-ink Reader first, then add KFX books from My Kindle Content folder or the Kindle's Document folder to Calibre manually. The book will be decrypted soon after you add it to Calibre library. And the decrypted KFX books will still be saved in KFX format.

convert books1

Step 5Convert KFX books.

Click Convert books in the tool bar and choose Epub/Mobi/PDF/AZW3/TXT... as the output format and click OK to start the conversion.

convert kfx to pdf with calibre

The book will have two formats for you to choose from after the conversion.

converted epub file calibre

Note: Though calibre can remove DRM from KFX books , the biggest disadvantage is that calibre can neither convert nor open decrypted KFX books.

No.3 -- Kindle Converter

Kindle Converter can easily convert Kindle DRM / DRM-free ebook to PDF ePub Word formats. User can view Kindle ebook on other computer or device and print Kindle ebook without DRM limitation. But it only supports Kindle DRM files downloaded from Kindle for PC/Mac and nodrm mobi files. And below are tutorial guide about how to convert KFX with Kindle Converter.

Step 1download Kindle Converter for Win/Mac to your computer and launch it.

Step 2download KFX books to your computer with Kindle for PC/Mac.

Step 3add Kindle KFX books to Kindle Converter.

After downloading KFX books via Kindle for PC/Mac, click Kindle and sync KFX books to Kindle Converter.

add kfx to kindle converter1

Note: Kindle Converter can't decrypt KFX books downloaded from Kindle e-ink devices.

Step 4choose output format and click Convert to start the conversion.

Select the KFX books you want to convert, then choose the output format and click Convert button.

convert kfx with kindle converter1

No.4 -- Kindle PDF Converter

EPubsoft Kindle PDF Converter is a professional ebook conversion tool which helps you to finish the conversion from Kindle to PDF, KFX to PDF, PDF to Kindle. Except converting Kindle Books to PDF, this software also supports to convert PDF to Kindle Books. And below are tutorial guide about how to convert KFX with Kindle PDF Converter.

Step 1download the KFX books to the computer via Kindle for PC/Mac.

Step 2download and install Kindle PDF Converter.

Step 3run Kindle PDF Converter and then click Add Files button to select your KFX books.

Kindle PDF Converter only allows you add KFX books to the softwre one by one.

Step 4convert KFX books.

Choose the output format. There are three options: PDF/AZW/Mobi. Then click Convert Now to start the conversion. When it's done, click Open to get your Converted books.

convert kfx with kindle pdf converter1

Note: If your KFX books are copied from Kindle e-ink device, you must input Kindle Serial number in order to decrypt KFX books. If you don't know where you can find the Kindle Serial Number, you can read the full guide on How to Easily Find the Kindle Serial Number.

input kindle serial number to remove drm1

The Comparison Chart of the 4 KFX Converter

Epubor Ultimate
Kindle Converter
Kindle PDF Converter
Automatically detect books
Support Kindle e-ink Devices
Must input Kindle Serial Number
Easy to use  
Super easy to use
Must install DeDRm plugin
easy to use but time-consuming
Only allow to add books one by one manually

Clean interface


Software Price



As you can see, among the above best 4 KFX converter, Epubor Ultimate, with the super clean interface, is the most easy to use software to remove KFX DRM and convert KFX books in the fastest speed. And it doesn't need you to add KFX books to the software manually, not even to install any plugin, which can save you a lot of time finding the downloaded books on your computer. If you prefer to using freeware, then Calibre is a good choice for you except the fact that you must install the DEDRM Plugin to convert KFX books.

Download Epubor Ultimate for Free

works for Epubor and writes articles about eBooks and eReaders. She explores the best method to help you read eBooks more freely and wants to share all she has got with you.

04/6/2019 02:22:58
Hi, Hillary Zhang. I need so much to remove drm from Kindle kFX-Zip archive and convert to PDF, but all my tries failed (i admit i´m not expert on the matter). My archive is available. Can you give me a hand? Thank you.    
04/9/2019 11:13:08
Install the KFX Input plugin to automatically locate all of the files that make up a KFX format book and gather them into a KFX-ZIP.  After the DeDRM plugin removes the DRM, then the KFX Input plugin will package it into a single KFX file. We can remove KFX DRM successfully using the calibre de-DRM plugin on our side. If you still failed to remove KFX DRM on your side, you can send us an email to get our professional help: epubor.alice@gmail.com
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