
Important notice:
To remove DRM from Kindle books, you should refer to this guide.
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 the 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 a 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 awesome software with so easy to use and intuitive interface. Below is the tutorial guide about how to convert KFX with Epubor Ultimate.
Step 1download Epubor Ultimate to your computer and launch it.
Step 2download KFX books to your computer with an older version Kindle for PC/Mac.
Note:
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 the Kindle column.
2. Downgrading the Kindle app to an older version is required to make Epubor Ultimate work.
Step 3add the KFX books from the left sidebar to the right main window to remove DRM.

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

Bonus tip:
Epubor Ultimate can’t remove KFX DRM if the Kindle books are downloaded from v1.34 or above Kindle desktop app. Downgrading your Kindle app to an older version is required to make Epubor Ultimate work smoothly. And for Mac users, you can follow this guide to remove Kindle DRM on Mac.

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 the DeDRM plugin, including the latest KFX books. Below is 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.

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.
Step 4add Kindle KFX books to Calibre by clicking Add books in the toolbar.
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 the Calibre library. And the decrypted KFX books will still be saved in KFX format.

Step 5Convert KFX books.
Click Convert books in the toolbar and choose EPUB/Mobi/PDF/AZW3/TXT... as the output format and click OK to start the conversion.

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

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 -- Epubor KCR Converter
Note: Epubor.com stops updating Epubor KCR Converter due to tech issues. SO please use Epubor Ultimate to convert Kindle files instead.
Epubor KCR Converter is a lightweight tool that helps you export Kindle books from Kindle Cloud Reader, removes Digital Rights Management copy protection and converts your Kindle books to PDF, EPUB, MOBI, TXT or AZW3 format with only one click. Just follow the below steps to convert your Kindle books that are downloaded from Kindle Cloud Reader to DRM-free files.
Step 1Visit Kindle Cloud Reader website on Google Chrome or new Microsoft Edge browser, and sign in your Kindle Cloud Reader account.
TipsEpubor KCR Converter only works with Google Chrome and new Microsoft Edge browser.
Step 2Download Kindle books on Kindle Cloud Reader.
Just open Kindle book, and it will start downloading automatically. Remember not to exit the current page until this book has been downloaded completely.

Step 3Download Epubor KCR Converter to your Mac.

All Kindle books downloaded from Kindle Cloud Reader will appear on the main interface of Epubor KCR Converter automatically.
Pro TipsYour Kindle books can appear on KCR Converter only when they are downloaded successfully. And remember to restart KCR Converter to upload newly downloaded Kindle books.
Step 4Convert Downloaded Kindle books to EPUB/Mobi/AZW3/PDF/TXT.
First, check the box in the front of the book title that you want to convert. Then select epub/mobi/azw3/pdf/txt as the output format. At last, click the convert button to start the conversion.

When the conversion complete, a folder containing all the converted Kindle books will pop up immediately.

Note: Unfortunately, Epubsoft Kindle PDF Converter no longer exists.
No.4 -- Kindle PDF Converter
Epubsoft Kindle PDF Converter is a professional ebook conversion tool that helps you to finish the conversion from Kindle to PDF, KFX to PDF, PDF to Kindle. Besides converting Kindle Books to PDF, this software also supports converting 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 to add KFX books to the software 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.

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.

The Comparison Chart of the 4 KFX Converter
Features |
Epubor Ultimate | Calibre |
KCR Converter |
Kindle PDF Converter |
|---|---|---|---|---|
Automatically detect books |
Yes | No |
Yes |
No |
Support Kindle e-ink Devices |
Yes | No |
No |
Must input Kindle Serial Number |
Easy to use |
Easy to use | Must install DeDRm plugin |
Super Easy to use |
Only allow to add books one by one manually |
Clean interface |
Yes | No |
Yes |
No |
Software Price |
$24.99/Year | free |
$14.99/Year |
$24.99/Year |
Conclusion
As you can see, among the above best 4 KFX converters, Epubor Ultimate, with a super clean interface, is the most easy to use software to remove KFX DRM and convert KFX books at a 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 use freeware, then Calibre is a good choice for you except for the fact that you must install the DEDRM Plugin to convert KFX books.

Amy Lopez crafts informative articles on eBooks and eReaders, uncovering optimal methods to enhance your eBook reading experience, and eagerly shares her findings with you.




