A file with the .azw file extension is a popular file format for storing eBooks for the Amazon Kindle e-reader series and devices using the Kindle app. Along with saving things like bookmarks, annotations, and the last known page, AZW files usually contain DRM protection or copy protection to prevent copying and illegal viewing.
What is an AZW file?
AZW files were first rolled out Kindle devices in 2007; It is based on the MOBI file format that Amazon purchased in 2005. Although AZW files are MOBI based, they contain better compression than MOBI files and are usable on Amazon Kindles or a Kindle software device.
Fourth Generation and later Kindles the AZW3 format, also called KF8, while the seventh generation and later Kindles use the KFX format
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How do I open?
Because AZW files were developed for Kindle, the easiest way to open one is on a Kindle device or with the Kindle app on Windows , Mac, iOS or Android.
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If you use Linux, you must be a third-party reader It's an open source app that offers enough versatility that you might even prefer it on Windows and MacOS, Caliber can open AZW files and many other formats.
All you have to do is to open the program, click on "Add books" and d ann, how to add your books.
 A few other options would be to send these files using the Send to Kindle application via a USB cable or e-mail to your Kindle. Everything that is sent is kept online in your personal Kindle documents, where they are kept and restored when you buy a new Kindle.
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How to Convert One?
Like any other file format, you need specialized software to convert AZW to another format. If you try to change the extension, you can work with a damaged and unusable file.
Caliber is not just an e-reader, it's also a handy conversion tool that lets you convert all your eBooks into 16 different formats. First, converting AZW requires your files to be DRM-free, so for this example, assume your files are not DRM-mapped.
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Open Caliber, select the book you want to convert, and click to "convert books".
In the conversion window Select the desired output format and click "OK" at the bottom of the window.
The converted file is stored in your library on your local drive. Available formats are displayed in the preview area of each book.