The Introduction of AZW File

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AZW is a proprietary format developed by Amazon. It has its roots in the MOBI format but has better compression and encryption apart from a few more changes. The AZW format has found its place in many platforms with Kindle reading apps apart from Kindle. But AZW files can only be obtained from the Amazon online bookstore.

Note: Since now Amazon adopts KFX as the latest ebook format, so if you sync the new purchased KFX books to local computer via Kindle for PC/Mac, the synced books are usually saved in .azw format which actually is a .kfx file. But if you download the same book via Kindle devices, you will get the book with .kfx extension.

AZW format is DRM (Digital Rights Management) restricted and is locked to the device ID which is registered automatically with the user account of the Kindle purchaser. But DRM free books also carry the AZW extension but they are really no different from MOBI files.

How to open azw file?

Usually, purchased AZW books comes with DRM protection. So an AZW file you've downloaded can be opened with all the free Kindle apps and devices developed by Amazon.

1Kindle Cloud Reader

Kindle Cloud Reader lets you read ebooks online instantly in your web browser. Kindle Cloud Reader automatically downloads your most recently read books so they are available offline.

First, you need to add Kindle Cloud Reader Extension to your Chrome browser.

add kindle cloud reader to chrome

Second, click Kindle Cloud Reader extension icon in the menu bar of Chrome browser and sign in Kindle Cloud Reader with your Amazon account.

sign in kindle cloud reader

You can set up Kindle Cloud Reader for offline reading after signing in.

enable offline

You can read the Kindle book offline by right clicking the book cover and select Download & Pin Book. Then Pinned book are available for offline reading until you remove them.

download and pin book

Now you can read any of your Kindle books online or offline by double clicking the book cover.

2Kindle for PC/Mac/iOS/Android

Kindle apps for PC/Mac/iOS/Android allows you read your Kindle books anytime and anywhere you want.

First, download Kindle for PC/Mac or Kindle for iOS or Android to your computer or devices.

Second, sign in with your Amazon account.

Third, you can read the AZW file you have downloaded after syncing them to your computer or devices.

3Kindle Devices

All series Kindle devices, like Kindle, Kindle Fire, Kindle Oasis, Kindle Paperwhite, Kindle Touch, Kindle Keyboard, etc, can open downloaded AZW books after syncing them to Kindle Devices.

How to open azw file on non-Kindle apps and devices

This question equals how to remove DRM from azw books and convert its formats.

AZW format is DRM restricted and is locked to the device ID which is registered automatically with the user account of the Kindle purchaser. So you need to remove DRM from AZW files before sharing this book with friends.

Removing DRM from AZW is pretty simple, just make sure the files are synced via Kindle for PC/Mac or connect the Kindle device with computer, then use Epubor Ultimate to handle it.

Step 1log in Kindle for PC/Mac with your Amazon account on computer.

Install Kindle for PC/Mac to your computer and launch it. Go to Tools>Options>Registration to complete the registration.

register kindle for pc1

Step 2click sync icon in Kindle for PC/Mac to download your purchased Kindle books to computer.

sync icon in kindle for pc

Step 3run Epubor Ultimate to remove DRM from Kindle books.

First, download Epubor Ultimate to your computer and launch it.

Download Epubor Ultimate for Free

Second, though Epubor Ultimate can detect the downloaded Kindle files automatically, you need to tap the Kindle to refresh Epubor Ultimate and all the downloaded kindle book will be displayed under Kindle column.

red spot on ultimate

Tips: There will be red spot besides Kindle to keep you informed if you download new Kindle book or delete any Kindle book from your computer.

Third, add the azw books from the left sidebar to the main window. All the books will be decrypted immediately. Super powerful.

azw decrypted

You can click Decrypted to find the DRM free AZW book.

Now you can share the decrypted book with your freinds and read it on any Kindle apps or devices without signing in. But you have to convert azw to other formats if you want to read it on non-Kindle apps and devices.

Forth, choose EPUB/AZW 3/ TXT/ PDF as the output format, then click Convert to XX to start the conversion.

convert azw other format

Now the purchased azw book is 100% owned by you.

How to edit azw file

Epubor Ultimate can also edit the metadata of decrypted azw file. But if you can't edit some decrypted azw file, then this azw file is definitely a KFX file. There's one limitation about Epubor Ultimate is that it can't edit a KFX file's metadata by now. But the good news is that you can convert azw to epub/azw3/mobi before editing the metadata.

You can start editing metadata by clicking the pen icon after azw file is decrypted.

edit meta

Calibre can edit azw file,too, but KFX files are not included. You can right click the book cover and select Edit metadata>Edit metadata individually.

edit meta calibre

Therefore, Calibre can neither open KFX file nor decrypted azw file(some DRM free azw file are actually kfx file), let alone edit the metadata. But Epubor Ultimate can decrypt DRMed azw files as well as convert formats. And it can also help you eidt the metadata of the decrypted book, including KFX file(you must convert KFX to epub/mobi/pdf/txt before editing metadata).

Tips: If you want to decrypt DRM-protected Kindle AZW books with Calibre, you can read this step-by-step guide about how to convert Kindle books to EPUB/Mobi/PDF with Calibre.


Since Amazon adopts KFX as the latest ebook format from October, 2017, AZW file is now the most common format among Kindle ebooks. So hopefully, this article will help you know more about azw file. And you can also turn to Epubor software for more professional help and unlock your purchased books from Kindle apps and devices.

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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.

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