In recent months, owing to the update for the Kindle, I guess many Kindle users may have downloaded Kindle books with KFX extension on Kindle eReader. It's a new format of Amazon Kindle, which is not very familiar to us. Now it's only supported on the latest Kindle eReader and Kindle IOS app. To read Kindle KFX files on more reading app or devices, we may have the demand to convert KFX to other widely used or common format. In this article, I will tell you how to converter KFX books to EPUB/AZW3/Mobi/PDF for details.
What's the KFX file and when will we get it
In August 2015, all the Kindle eReaders rolled out within the last 2 years were updated with a new typesetting and layout engine that adds hyphens, improved word spacing and ligatures to the eBooks that supports this engine require the use of the new KFX format of Amazon.
I guess the new KFX file is unknown for most of us. But do you know when and how will we get this new KFX file? In fact, not all the books we downloaded are with KFX extension. If we use the latest Kindle eReader such as Kindle Paperwhite or Kindle Voyage and download eBooks supported enhanced typesetting, we will get KFX file.
But it’s not quite easy yet to get KFX books. Not all Kindle books support the new layout engine. Amazon has claimed that there are around 100,000 eBooks on their website which are in the new KFX format. If you want to find whether the book supports new KFX format, just look on the book's description page at Amazon. You can see a label that shows if enhanced typesetting has been enabled.
If we have got KFX file, when we connect our Kindle to computer via USB, we can find KFX file in Kindle "document" folder are with .kfx extension.
How to convert KFX books to EPUB/AZW3/Mobi/PDF
As the KFX is the new format of Amazon, currently, there is no eBook Converter including Calibre can directly convert this file to other common format. If we add or drag a KFX file to Calibre or other eBook Converter, it usually shows up an alert "unknown eBook type or unsupported eBook format". Does this imply that we cannot convert KFX books to other formats we like? Of course not, though we cannot directly convert KFX books to EPUB/AZW3/Mobi/PDF format, there are another 2 indirect methods for us to handle KFX file.
We can sync our downloaded KFX files on our Kindle via Kindle for PC/Mac, and we will get the common used AZW format. Or We can directly download KFX file which has already synced via our Kindle from Amazon website, then it will be saved as AZW3 or AZW file on our computer, just transfer it to Kindle via USB. If we have got common AZW or AZW3 files, then we can use a professional eBook Converter to convert KFX to EPUB/AZW3/PDF/Mobi format. Next I will tell you the 2 methods for details. But before that, we have to prepare the tool first.
Get the tool ready
To convert eBook format, we need an eBook converter to help us. Here I prefer a powerful program Ultimate eBook Converter, and want to share it with you. This tool can convert both DRM free and DRM protected KFX books to EPUB/AZW3/Mobi/PDF. It also supports batch conversion. We can convert more than 1 file at a time within a few seconds. All of these are the main reasons I like it. You can download it for free trial.
Method1: Convert KFX files from Kindle for PC/Mac
If we sync our downloaded KFX files on our Kindle via Kindle for PC/Mac, we won't get KFX file, but AZW book.
Step1: Sync KFX books via Kindle for PC/Mac
Login your Kindle for PC/Mac, click the "Archived Items" on the left side and find the KFX books you have downloaded on your Kindle device, then double-click its cover to download it to your computer. Have not installed Kindle for PC/Mac? Please install and download it now.
After the download has been finished, you will find they are saved as common AZW format, instead of the KFX file.
Step2: Remove DRM from Kindle books
As most of downloaded Kindle books are protected by Kindle DRM, to convert eBook format, we'd better remove DRM first.
Run the Ultimate eBook Converter, usually if your downloaded books are saved in the default folder "My Kindle Content", they will be automatically detected and uploaded to this software. You can see them under "Kindle" icon. A really friendly design for users. No need to add books by yourself.
Next, what we need to do is only to drag Kindle books from the right side to the left frame of this program. Then all the added books will be decrypted soon. You can see the word "decrypted", which shows books have been removed DRM successfully.
Step3: Convert KFX to EPUB/PDF/Mobi/AZW3
After we have removed Kindle DRM successfully, now we can convert DRM free books to EPUB/PDF/Mobi/AZW3. As the image above shows, after removing DRM from AZW file, the decrypted books are Mobi or AZW3 format. We need not to convert all of them to Mobi or AZW3 files.
Currently, this software cannot convert eBooks to Kindle AZW3. If you need, you can just convert them to Kindle Mobi. As long as the devices or app support AZW3, they can also read Mobi files. Besides, Mobi format has better compatibility.
To convert decrypted Kindle files to EPUB/PDF, just choose "EPUB" or PDF as the output format, then click "Convert" button to start conversion.
When the conversion has been finished, you will see a "Succeeded" on the right side of your added books, at the same time, a window will pop up, which shows us all the converted files.
Method2: Convert KFX files directly downloaded from Amazon website
Except method1, there is another useful way to convert KFX books to EPUB/AZW3/Mobi/PDF.
Step1: Download purchased books from Amazon website
Enter Amazon website, log in it with your Amazon account. Then hover over the "Your Account" drop-down menu, select "Manage Your Content and Devices", you can see all your Kindle content here. Just find the KFX books you have downloaded via Kindle device, then tap the button under "Actions", click "Download & transfer via USB".
Then a following window will pop up, just select the Kindle to which you want to transfer the book. Then click "Download" button to download the book to your computer.
You can see these downloaded files will be saved as AZW or AZW3 files, while we will get KFX file if we sync them via Kindle device.
After downloading, what we need to do is only to connect our computer to Kindle via USB and transfer downloaded books from computer to Kindle's document folder.
Note: Downloaded AZW or AZW3 files can only be opened on the Kindle you have selected, and are always Kindle DRM protected, you cannot open them via Kindle for PC/Mac or other Kindle device.
Step2: Remove Kindle DRM from Kindle e-Ink device
If we want to convert KFX to EPUB/PDF, we also need to remove Kindle DRM from Kindle e-Ink device. It's easier. Just connect Kindle to computer, drag books from the right side to the left panel. Then all the downloaded books will be decrypted.
Step3: Convert KFX to EPUB/PDF/Mobi/AZW3
This step is the same as step3 mentioned in the method1. Here I won't introduce again.
What a friendly and powerful program! Almost all the operation is automatic, we can convert KFX files to EPUB/PDF/Mobi with only 1 click. What's more, its conversion speed is very fast, which can really save us much time.
If you are looking for the way to convert KFX file to EPUB/PDF/Mobi, why not try these 2 methods to handle your KFX file and download the tool for free trial? Hope it will work for you.
Make your KFX files freely and readable on any portable devices
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Ada Wang works for Epubor and writes articles for a collection of blogs such as ebookconverter.blogspot.com.