Kindle books are protected by DRM, and Amazon's current standard eBook format is KFX (also known as KF10). This guide explains what the KFX format is and provides a overview of methods people use to remove DRM from Kindle KFX books and convert KFX to PDF for broader device compatibility or personal backups.
1. What is KFX Format?
Amazon introduced KFX as the successor to older formats like AZW3 (KF8) and MOBI. By 2026, nearly all new and recently purchased Kindle books download in KFX.
Key features of KFX:
1. Enhanced typesetting, better hyphenation, improved word spacing, and adaptive layouts.
2. Complex container structure: Often a bundle of files (encrypted main content, metadata, DRM voucher, images/fonts) rather than a single file.
3. Stronger DRM enforcement compared to older AZW3 files.
4. File extensions: Typically .kfx, but may appear as .azw, .azw8, .azw9, or even import as KFX-ZIP in tools like Calibre if not properly handled(fail to remove DRM).
2. How to Remove Kindle KFX DRM and Convert to PDF?
Epubor Ultimate is a powerful and user-friendly DRM removal tool designed to effortlessly remove KFX DRM. It supports converting eBooks into multiple formats—including EPUB, PDF, MOBI, AZW3, DOCX, and TXT — offering maximum flexibility and convenience for your reading needs.
Step 1Download and Install Epubor Ultimate
Step 2Download Kindle Books with Kindle for PC
The latest Epubor Ultimate now supports Kindle for PC v2.8.0. First, download and install this version, then log in to your Amazon account and start downloading your Kindle books.
Download Kindle for PC v2.8.0 Here
How to Remove Kindle DRM on Mac(Updated 2025/8/29):
Mac users can remove Kindle DRM by following this guide.
Step 3Remove KFX DRM
Launch Epubor Ultimate, and any Kindle books downloaded via Kindle for PC will automatically appear under the "Kindle" tab in the left sidebar. Simply drag them to the right pane to remove KFX DRM.
1. Encountering a "Kindle KFX" Error?
If you encounter a KFX DRM error, it may be because you are not using Kindle for PC v2.8.0. To resolve this, please follow the steps below:
1. Uninstall your current Kindle for PC.
2. Install Kindle for PC v2.8.0 and redownload your Kindle ebooks.
3. Restart Epubor Ultimate and try removing the KFX DRM again.
Once the decryption process is complete, a "Decrypted" label will appear next to the book title. Click the label or the book folder icon to access the DRM-free Kindle books, and its location will open on your computer.
Step 4Convert KFX to PDF
After removing Kindle DRM, choose "PDF" as the output format and click the "Convert" button to start the conversion process. Once completed, a "Succeeded" label will appear next to the book title. Click the label to access your DRM-free PDF file.
Conclusion
While KFX strengthens Amazon's ecosystem, readers can use Epubor Ultimate to own their purchases fully. Key benefits include:
1. Reading on non-Kindle devices (e.g., tablets, e-readers like Kobo/Sony/Nook).
2. Creating backups or archiving your library.
3. Converting to PDF for printing, annotations, or compatibility with apps that don't support Kindle formats.
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.
À chier!
J'ai une license à vie pour epubor KCR Converter for Mac en lifetime license. Ce logiciel n'a été installé que sur mon mac 27". La semaine dernière il me demande renouveller ma licence. Je peux la visualiser ma license sur mon compte epubor ou il est bien stipuler qu'il s'agit d'une license à vie. Mais quand je lance epubor il me demande renouveller cette license.
Le support n'a été d'aucune utilité tout en reconnaissant que j'ai une lifetime license.
Je pense qu'Epubor n'est pas une société honnête.
Please don't worry.
Hi,
I have tried all 3 methods without success.
How about giving those of us who could not get it to work remote directs hands-on support by us given Epubor Ultimate access to our laptops and desktops.
I will gladly give you full access to my laptop, so you can set it up so Epubor Ultimate works on my laptop. You or I can make a screen recording of it, which you can use as a tutorial for others to see on video. (In case I would make a screen recording of it, I can send it to you via Dropbox.)
Doing that for clients who have difficulties making it work would make Epubor Ultimate very attractive to a wide public and result in the best reviews. And it might not give you more work than replying to emails, chats via Skype, or on the above mentioned website page I copied the link to.
I hope you take up my offer to take control of my laptop to set up Epubor Ultimate right as only one of your technical experts knows how. It would be most effective
Doesn't work anymore.
Reached to the support and asked for a refund.
They sent me a link to this page instead.
Still doesn't work and my money is still gone.
This is a joke.
Thank you for using our software. Is there any error message? Doesn't work doesn't mean this software cannot handle kindle books? Our technical staff always want to help our customers to fix issue. So please describe your issue clearly and send them to our customer support via support@epubor.com. You can also reach us via livechat at every page on our website to get instant support. Please don't worry. If your choice is refund, you can also ask for refund. We will help you handle all your requests at the very first time.
Thank you for your understanding.
Thank you