How to Convert Kindle KFX to Epub/PDF/Mobi with Calibre

Posted by on .

A terrific good news for loyal Calibre users is last week Apprentice Alf released a new version of the DeDRM tools with added support for KFX format, so now you can easily import KFX books to Calibre to remove KFX DRM in order to create backups and convert them to other formats. So in this article I am going to show you how to remove DRM from KFX books and convert KFX to Mobi/Epub/PDF step by step.

How to Convert Kindle KFX to Epub/PDF/Mobi with Calibre

The DeDRM Calibre plugin is intended to help anyone looking for free software for removing DRM from their purchased Kindle KFX ebooks. But we have to admit that the biggest inconvenience about using Calibre to remove DRM is that you have to install De-DRM Plugin and KFX Conversion Input Plugin to Calibre first. And this is also the most difficult and also indispensable part to use Calibre to convert DRMed KFX books to Epub/PDF/TXT...

Step 1download Calibre to your computer and launch it.

Step 2download DeDRM_tools and KFX Conversion Input Plugin to your computer.

Remember to unzip the DeDRM_tools plugin package, or you won't be able to load the plugin to calibre successfully.

Step 3load DeDRM Calibre Plugin and KFX Conversion Input 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 DeDRM_tools folder and, in the folder DeDRM_calibre_plugin, find the file DeDRM_plugin.zip. Click to select the file and select Open.

dedrm calibre plugin1 dedrm plugin zip

Click Yes in the "Are you sure?" dialog box. Click the OK button in the "Success" dialog box.

calibre yes calibre ok

Then repeat the same operation to load the zipped KFX Input folder to Calibre.

The loaded DeDRM plugin will be displayed under File type plugins.

dedrm location

And the loaded KFX Conversion Input Plugin will be displayed under Conversion input plugins.

conversion input plugins

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

You need to download KFX books with 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.

convert books1

The KFX books downloaded with Kindle for PC/Mac will be saved in .azw format.

kfx content Pc

While the KFX books downloaded with Kindle device will be saved in .kfx format.

kfx content device

When you add KFX books to Calibre library, please make sure that your know exactly where your downloaded KFX books are stored on your computer.

If your KFX books are downloaded to your computer with Kindle for PC/Mac, you need to add KFX books to Calibre library from My Kindle Document folder.

add kfx from my kindle document

Step 5Convert KFX to Epub/Mobi/PDF

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

How to Convert Kindle KFX to Epub/PDF/Mobi without Installing Plugins

Epubor Ultimate is the first software to declare that it can remove DRM from KFX books not long after Amazon adopts the latest the KFX format. Epubor Ultimate equals an eBook DRM Removal and eBook Converter, which makes it super easy and convenient to decrypt and convert a bunch of books to ePub, PDF or Mobi with just 2 clicks.

Below is the step-by-step guide on how to remove Kindle DRM on Windows computers. For Mac users, you can follow this detailed guide to remove Kindle DRM instead.

Step 1Install the latest version Epubor Ultimate on your PC.

Download Epubor Ultimate for Free

Step 2Check the Kindle for PC version.

Notice: Epubor Ultimate does not work with version 1.35 and higher Kindle for PC. If you are using version 1.35 or higher Kindle for PC, after launching Epubor Ultimate, there will be a downgrade button on the upper left corner of the software to remind you to downgrade the Kindle app to an older version. Just click the downgrade link to start the downgrading automatically. If you are using version 1.34 or lower Kindle app, you can jump to step 3.

downgrade kindle app to 1.32

Step 3Redownload all Kindle books.

If you have downloaded Kindle books with version 1.35 or higher Kindle for PC, first, please navigate to My Kindle Content folder: C:\Users\User Name\Documents\My Kindle Content. And delete all the files in this folder. Then run the Kindle app and redownload all your Kindle books.

right click to download

Step 4Remove Kindle DRM.

All Kindle books that have been downloaded via the Kindle for PC will be displayed under the Kindle tap in the left sidebar. You can select all Kindle books and drag & drop them to the right main window. Time to witness the magic. All Kindle books are DRM free now! You can find the DRM free Kindle files by clicking the book folder icon on the lower right corner of the software.

remove kindle drm

Step 5choose PDF/ePub/Mobi/TXT/AZW3 as the output format and click Convert to PDF/ePub/Mobi/TXT/AZW3 to start the conversion.

convert kindle to pdf

Calibre VS. Epubor Ultimate

Calibre is an open source freeware ebook library manager. It is the best tool around for keeping track of your ebooks. The DeDRM plugin for Calibre provides a free way to remove DRM from your Kindle and Adobe DRM ebooks. Though Epubor Ultimate is a paid software, it has absolute advantage over Calibre. First of all, you don't have to download the DeDRM plugins and the KFX Conversion Input Plugin. This could be a pain in the ass if you are a tech newbie. Second, Epubor Ultimate supports removing DRM from KFX books downloaded from Kindle e-Ink Reader. Third, Epubor Ultimate can automatically detect all of your downloaded Kindle books, so you don't need to add your downloaded KFX books to the software manually.

In a word, Calibre is not as easy as Epubor Ultimate, it's a little difficult to handle for some people who is not skillful. Epubor Ultimate can definitely save you a lot of trouble by converting DRMed books to Mobi/ePub/PDF... So it totally worths your money. And if you are not satisfied with Epubor software, you can get your money back within 30 days after you place the order.


Comparing Calibre with Epubor Ultimate, to be honest, both tools have their own advantages. But Epubor Ultimate makes it more efficient and convenient to remove DRM from KFX books and convert KFX to Mobo/Epub/PDF... If you are not tech savvy, we strongly suggest you use Epubor Ultimate to solve your problem directly with simply 2 clicks.

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.

06/23/2018 22:18:17
V. helpful!  Worked like a charm -- TY!
05/31/2019 13:18:07
My husband and i have been absolutely satisfied  Emmanuel could conclude his studies using the precious recommendations he received when using the blog. It is now and again perplexing to just always be freely giving points that other people might have been making money from. And we also understand we have got the writer to appreciate because of that. The entire illustrations you've made, the straightforward blog navigation, the relationships you can assist to engender - it's many amazing, and it's really helping our son in addition to us recognize that that theme is awesome, which is certainly pretty essential. Many thanks for the whole lot!
<a href="http://www.goldengoose-sneakers.com" >golden goose sneakers</a> [url=http://www.goldengoose-sneakers.com]golden goose sneakers[/url]
12/5/2018 04:56:37
that worked great
12/5/2018 08:47:13
We are glad to know that this method works great.
12/6/2018 19:45:17
great, thank you very much!
12/7/2018 15:21:07
Thank you for your comments. We are glad to know this article can help you.
12/19/2018 19:45:13
no longer works leaves file in KFX-ZIP and still with drm on it
12/20/2018 14:13:32
Please ensure you are using the Kindle for pc/mac version before 1.25 to download the Kindle kfx ebooks. Then run Epubor Ultimate to remove the drm, I am pretty sure it works fine. If you can not figure out how to do it, please contact our customer service support@epubor.com to get more assistance.
01/29/2019 05:14:44
yup- doesn't seem to work with v1.25 - i get same result as above. DRM not removed
01/29/2019 14:29:32


Yes after Kindle desktop v1.25 and firmware 5.10.2 released, amazon kindle changed their drm scheme technology, which results in drm removing failed.

You'd better downgrade your Kindle for PC/Mac to 1.24(1.23) and STOP auto-update.

Then, use either Epubor or Calibre to help you.

05/9/2019 04:54:56
Thank you very much for the guidelines and tips given. The end results is marvelous. Now I can read my Kindle books easily on my android phone.
05/9/2019 10:21:56
Glad to know that you like this guide. If you think this guide is helpful, please share it!
06/4/2019 18:44:52

I have followed the process above. However, when I am going to convert the file kindle, I received the message " cannot covert the ...." This book is locked by DRM...

What did I do wrong?

ps: I had downloaded the last versions of  DeDRM_tools and KFX Conversion Input Plugin.
I am going to enrol a Master and most of the books are in Kindle format.

Thank for your help.

06/5/2019 09:00:00
If there is the error message "..locked by Kindle drm", that means your book are not decrypted. Please follow the instruction again. I know this is a little bit difficult. Also, you can download Epubor Ultimate to remove Kindle drm and convert it to any other format. This software is easy to use.
06/24/2019 08:09:15
Thanks, man. Worked like a charm. As I dowloaded from my eInk device, just configured the plugin with the serial number and bam! ePub done! :)
06/24/2019 08:49:58
Thank you for your comments.
Have a nice day!
07/26/2020 10:19:38
Awesome. Thanks for this guide. I was able to finally get it to work!
For me,  2.24  version didn't work. I tried 1.17 version, the file was automatically shown in Calibre as AZW instead of KFX-ZIP. Though I had to disable my Windows Defender Firewall and Security Software to be able to successfully download DeDRM 6.8, KFX and Kindle 1.17 version. Now, I’m a happy camper… Enjoy
08/29/2020 14:48:41
Tx it's work
08/31/2020 11:16:31
Thank you for your feedback. That's glad to hear.
03/1/2021 21:10:12
I precisely wanted to appreciate you once again. I am not sure what I would have undertaken in the absence of the secrets contributed by you directly on such area. It absolutely was a very depressing dilemma in my circumstances, but taking a look at the specialised technique you dealt with the issue forced me to cry with gladness. I am just happy for this service and as well , pray you really know what a great job you have been providing educating most people through the use of your web page. I know that you haven't met all of us.
<a href="http://www.golden-goose.us" >golden goose sneakers</a> [url=http://www.golden-goose.us]golden goose sneakers[/url]
10/15/2020 16:02:31

Please help. When i tried to install DRM tools this message i got :

calibre, version 5.2.0
ERROR: Unhandled exception: <b>SyntaxError</b>:invalid syntax (calibre_plugins.dedrm.__init__, line 168)

calibre 5.2  embedded-python: True is64bit: True
macOS-10.15.7-x86_64-i386-64bit Darwin ('64bit', '')
('Darwin', '19.6.0', 'Darwin Kernel Version 19.6.0: Mon Aug 31 22:12:52 PDT 2020; root:xnu-6153.141.2~1/RELEASE_X86_64')
Python 3.8.5
OSX: ('10.15.7', ('', '', ''), 'x86_64')
Interface language: None
Successfully initialized third party plugins: Gather KFX-ZIP (from KFX Input) (1, 34, 0) && Package KFX (from KFX Input) (1, 34, 0) && KFX metadata reader (from KFX Input) (1, 34, 0) && KFX Input (1, 34, 0) && Set KFX metadata (from KFX Output) (1, 44, 0) && KFX Output (1, 44, 0) && Obok DeDRM (6, 7, 0)
Traceback (most recent call last):
  File "calibre/gui2/preferences/plugins.py", line 317, in add_plugin
  File "calibre/customize/ui.py", line 472, in add_plugin
  File "calibre/customize/ui.py", line 61, in load_plugin
  File "calibre/customize/zipplugin.py", line 282, in load
  File "importlib/__init__.py", line 127, in import_module
  File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 671, in _load_unlocked
  File "calibre/customize/zipplugin.py", line 174, in exec_module
  File "calibre/customize/zipplugin.py", line 170, in get_code
  File "calibre_plugins.dedrm.__init__", line 168
    print u" v: Copying needed library files from plugin's zip".format(PLUGIN_NAME, PLUGIN_VERSION)
SyntaxError: invalid syntax

10/16/2020 17:24:52
Yes, that's because the latest calibre version 5.0 or later is not compatible with the calibre drm-removal plugin. Please follow this guide to get this problem fixed: https://www.epubor.com/solutions-to-calibre-dedrm-plugin-not-working.html
11/23/2020 04:22:04

I downloaded the DeDRM Calibre Plugin and KFX Conversion Input Plugin, and installed them to Calibre. I'm running Calibre 3.30

I downloaded a Kindle Book (using Kindle 1.26.1), and located the .AZW file.

When added to Calibre, the book cover now appears, and the format is KFX-ZIP. When I try to convert to ePub, I get an error that the book contains DRM and cannot be converted.

What am I missing? Thanks!!

11/23/2020 09:20:39
Thank you for asking. To remove drm from kindle books, please download kindle books via kindle for pc 1.24 or earlier version.
11/23/2020 09:21:44
Here is the way to downgrade kindle for pc to older version>> https://www.epubor.com/how-to-downgrade-kindle-for-pcmac.html
02/27/2021 05:15:58
I must express  appreciation to the writer just for bailing me out of this type of difficulty. Just after checking throughout the world wide web and seeing suggestions that were not pleasant, I figured my life was over. Living devoid of the strategies to the problems you've resolved by means of your main website is a serious case, as well as ones which could have adversely damaged my entire career if I had not encountered your website. That know-how and kindness in taking care of every aspect was valuable. I don't know what I would have done if I had not come across such a step like this. It's possible to at this moment relish my future. Thanks so much for this specialized and amazing guide. I won't think twice to endorse your web sites to any person who requires direction on this subject.
<a href="http://www.supremes-clothing.com" >supreme clothing</a> [url=http://www.supremes-clothing.com]supreme clothing[/url]
11/23/2020 22:01:13
Thanks, Epubdor...but there's a highlight banner on the downgrade instruction page that say "Notice: If you are on Mac Catalina 10.15, downgrading kindle to 1.23 or older will not work any more"
11/24/2020 08:53:57
Thank you for contacting us. If you are mac catalina, please follow this guide to remove kindle drm:
03/1/2021 02:48:11
Hello, epubor didn't work! and I installed the DRM plug-in in Calibre and that ddn't work either :(
04/10/2021 20:18:22
ghvfeòodsbakuyvfbrqendaoòshvfb fviocxbdefhoieqvihdbhwiqocvbijodbnsmwsbdbjcv2pvròbiejbdpxisjbev òidgpuxskdnfew -4lògidhuxnjzx vbt-hrdilke fvbòdcj-òkjehfbewjdnsalkq
09/22/2021 14:04:40
Sadly all failed for me :/
09/27/2021 09:43:20
Have you tried the Epubor Ultimate? If you have any issue with Epubor Ultimate, please feel free to contact us via support@gmail.com.
06/21/2022 22:53:59
Absolutely FAIL!!! it does not solve the ddm
08/24/2022 05:52:19
For those of you who are still struggling rent your books through a digital library and go ahead download adobe digital editions 4.5. Once you rented click on download epub make sure the book is going to adobe digital. Calibre works perfectly with adobe, I've used kindle pc 4 months ago with no problem and now kfx has been implemented on all books calibre fails to dedrm.
01/6/2023 05:37:27

"A terrific good news for loyal Calibre users is last week Apprentice Alf released a new version of the DeDRM tools with added support for KFX format, so now you can easily import KFX books to Calibre to remove KFX DRM in order to create backups and convert them to other formats."

The link to the dedrm tool on this page references 7.21 from 2021 and does not include kfx, despite the blurb.

01/16/2023 10:43:53
Thank you for your message. You can use this link to get the latest dedrm plugin: https://github.com/noDRM/DeDRM_tools/releases/tag/v10.0.3
01/7/2023 06:34:11
I can't find the updated version of DRM-tools either.  
01/16/2023 10:45:59
Thank you for your feedback. We've updated this article, please click the link in this article to get the latest dedrm tool.
01/25/2023 04:39:08
I installed the latest version of DeDRM (10.0.1?) and the KFX plugin. Both installed fine, but an Amazon book I bought and downloaded today isn't "cleaned" after being loaded in Calibre, so it wouldn't convert(message: Has DRM). I'm using the latest Kindle for PC (1.39), and version 3.48 of Calibre. Any thoughts?
Leave a comment
YourName *
Comments UBB Editor
Home > Guide >How to Convert Kindle KFX to Epub/PDF/Mobi with Calibre
mcafee badgenorton badge