If you've ever downloaded a book from Amazon and found a file with a .azw or .azw3 extension, you've encountered one of Amazon's proprietary Kindle formats. These files are everywhere — but most people have no idea how to open them on a non-Kindle device, or how to convert them to a more portable format like PDF.
This guide explains exactly what AZW and AZW3 files are and how to convert them to PDF for free.
What is an AZW File?
AZW stands for Amazon Word. It's Amazon's proprietary eBook format used exclusively on Kindle devices and the Kindle app. AZW was introduced alongside the original Kindle in 2007 and is based on the older Mobipocket format.
| Format | Full Name | Year | Used For |
|---|---|---|---|
| AZW | Amazon Word | 2007 | Early Kindle eBooks |
| AZW3 | Kindle Format 8 (KF8) | 2011 | Modern Kindle eBooks |
| MOBI | Mobipocket | 2000 | Older eReaders |
| EPUB | Electronic Publication | 2007 | Non-Amazon eReaders |
What is the Difference Between AZW and AZW3?
AZW is the older format, based on MOBI. It has limited support for complex formatting.
AZW3 (also called KF8 — Kindle Format 8) is the modern successor. It supports HTML5 and CSS3, enabling richer layouts, better fonts, and more complex eBook designs. Most Kindle books purchased after 2011 are in AZW3 format.
Convert AZW / AZW3 to PDF Free
Upload your DRM-free AZW file and download it as PDF — no software needed.
⚡ Convert Now →How to Convert AZW to PDF Using DocToPDF
- Go to DocToPDF.io
- Drag and drop your .azw or .azw3 file
- Click "Convert All to PDF"
- Download your PDF
Our converter extracts the text content from the AZW/AZW3 file and renders it as a clean, readable PDF. Since AZW3 is built on HTML/CSS, the text extraction is generally very clean.
How to Open AZW Files Without a Kindle
If you just want to read the file rather than convert it, you can use the free Kindle for PC or Kindle for Mac app. The Kindle app for iOS and Android also opens AZW files if they're in your Amazon account.
Can I Convert AZW3 to EPUB Instead?
Yes — tools like Calibre (free, open-source) can convert AZW3 to EPUB, MOBI, TXT, and other formats. Calibre is the most powerful eBook management tool available and is free to download at calibre-ebook.com.
Summary
- AZW = Amazon's older Kindle format (based on MOBI)
- AZW3 = Amazon's modern Kindle format (based on HTML5/CSS3)
- Most Kindle purchases use AZW3 today
- DRM-free AZW files can be converted to PDF using DocToPDF
- DRM-protected files need DRM removal before conversion