AZW3 is Amazon's e-book format for newer Kindle devices and apps

An AZW3 file is an e-book stored in a format that Amazon created for Kindle devices released after 2011. It is the modern version of Amazon's older AZW format. When you buy a book from Amazon's Kindle Store, you are usually getting an AZW3 file, whether you read it on a Kindle e-reader, a Kindle app on your phone, or a Kindle app on your computer.

The file extension ".azw3" tells you what kind of file it is, the same way ".pdf" tells you a file is a PDF. AZW3 files contain the book text, formatting, fonts, and sometimes images or interactive elements. Amazon uses this format because it gives them control over how books appear and whether readers can copy text or share files.

If you have ever downloaded a book to read offline on a Kindle device or app, that file was likely an AZW3. The format is proprietary to Amazon, which means only Amazon's software and devices are designed to read it without extra steps.

Key Takeaways

  • AZW3 files are Amazon's e-book format, used for most books sold through the Kindle Store since 2011.
  • You can read AZW3 files on any Kindle device or on free Kindle apps for phones, tablets, and computers.
  • AZW3 files come with copy protection that prevents you from easily sharing or converting them to other formats.
  • If you want to read e-books from multiple sources without buying multiple apps, you may need to convert files or use a device that reads multiple formats.

Where AZW3 files come from

Most AZW3 files come from Amazon's Kindle Store. When you purchase or borrow a book through Kindle Unlimited, you receive an AZW3 file that downloads to your device or app. Some publishers and independent authors also distribute AZW3 files directly, though this is less common.

You cannot create an AZW3 file yourself unless you are a publisher or author using Amazon's publishing tools. If you have a PDF, Word document, or other text file, Amazon's tools can convert it to AZW3 format for you to publish, but that is a different process than reading an existing AZW3 file.

How to read AZW3 files

The easiest way to read an AZW3 file is to use a Kindle device or a free Kindle app. Amazon offers Kindle apps for iPhones, Android phones, iPads, Mac computers, and Windows computers. You read the app, sign in with your Amazon account, and your books appear automatically.

If you have a Kindle e-reader (like a Kindle Paperwhite or Kindle Oasis), AZW3 files sync across all your devices through your Amazon account. You can start reading on your phone and pick up where you left off on your e-reader without any extra steps.

If you want to read an AZW3 file on a device or app that is not made by Amazon, you will need to remove the copy protection first. This is where things get complicated, because the legal status of removing copy protection varies by country and by the specific method you use.

Copy protection and why it matters

Most AZW3 files sold through the Kindle Store include digital rights management (DRM), a form of copy protection. DRM prevents you from copying text, sharing the file with others, or converting it to a different format. It also ties the file to your Amazon account, so only you can read it.

This protection exists because publishers and authors want to prevent unauthorized copying and distribution. From Amazon's perspective, it also keeps readers within the Kindle ecosystem. If you buy a book as an AZW3 file, you are buying the right to read it on Amazon's devices and apps, not the right to own the file itself.

Some AZW3 files, particularly those from independent authors or small publishers, may not have DRM. You can tell by trying to convert the file or share it. If it converts easily, the DRM is not present. If you get an error, the file is protected.

Converting AZW3 to other formats

If you want to read an AZW3 file on a device that does not support Kindle apps — such as a Kobo e-reader or an older tablet — you may want to convert it to a different format like EPUB or PDF. Tools like Calibre (free, open-source software) can convert AZW3 files, but only if they do not have DRM protection.

If your AZW3 file has DRM, Calibre will not convert it. Removing DRM is a technical process that involves additional software and varies by operating system. The legal status of DRM removal is complex: in some countries it is permitted for personal use, in others it is not. Before attempting to remove DRM, research the laws in your location.

A simpler alternative is to check whether the book is available in a different format from another source. Many books are sold as EPUB files through other retailers like Apple Books, Google Play Books, or independent bookstores. If you buy the same book from a different source, you may get a format that works on your device without conversion.

AZW3 versus other e-book formats

The most common e-book formats are AZW3 (Amazon), EPUB (used by most other retailers and libraries), and PDF (used for documents and some books). EPUB is an open standard, meaning any company can build software to read it. AZW3 is proprietary to Amazon.

If you read books from multiple sources — Amazon, your library, Apple Books, Google Play — you will encounter different formats. EPUB is the most portable: it works on Kindle apps, Kobo devices, Apple Books, most library apps, and many other readers. AZW3 works only on Amazon's devices and apps. PDF works everywhere but does not adjust text size or reflow as smoothly on small screens.

For someone trying to avoid multiple subscriptions, this matters. If you use your library's e-book service, you are likely getting EPUB files. If you buy from Amazon, you get AZW3. If you want to read both without switching apps, you need a device or app that supports both formats, or you need to convert files.

Frequently Asked Questions

Can I read an AZW3 file on a non-Kindle device?

Not directly, unless the device has a Kindle app installed. You can read AZW3 files on iPhones, Android phones, tablets, and computers through the free Kindle app. If you want to read on a different e-reader brand like Kobo or Tolino, you would need to convert the file, which requires removing copy protection first.

What happens if I delete an AZW3 file from my device?

If you delete it from your device, you can read it again from your Amazon account at any time. The file is stored in your Amazon library in the cloud. Deleting it from your device does not delete it from your account, so you have not lost the book.

Can I share an AZW3 file with someone else?

Not easily. AZW3 files are tied to your Amazon account and protected by copy protection. Sharing the file itself is not straightforward. If you want someone else to read the book, they would need to purchase or borrow it themselves through Amazon or another source.

Is AZW3 the same as AZW?

No. AZW is Amazon's older format, used on first-generation Kindle devices. AZW3 is the newer format used since 2011. Newer Kindle devices and apps read both, but AZW3 is what you will encounter with almost all books sold today.

Do library e-books come as AZW3 files?

Most library e-books come as EPUB files, not AZW3. Some libraries partner with Amazon to offer Kindle books, in which case you get AZW3 files. Check your library's website to see which formats they offer. Many libraries support both EPUB and AZW3 through different apps or services.