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AZW3

Amazon Kindle Format 8

AZW3 is Amazon's current Kindle e-book format, also known as KF8 (Kindle Format 8). Introduced in 2011, AZW3 supports modern typography features that the older MOBI format couldn't handle — custom fonts, drop caps, fixed layouts for children's books and graphic novels, and CSS3 styling. Every modern Kindle book ships in AZW3 format.

What is AZW3?

AZW3 is built on XHTML5 and CSS3, packaged inside a Mobipocket-compatible container. Internally it's similar to EPUB3 but with Amazon-specific extensions and DRM. Amazon ships AZW3 alongside a backwards-compatible MOBI version inside a single .azw or .azw3 file — older Kindles read MOBI, newer ones read AZW3. The format supports rich layouts, embedded fonts, audio, and video.

AZW3 pros and cons

Advantages

  • Modern typography — drop caps, custom fonts, advanced CSS
  • Native on all Kindle devices and Kindle apps
  • Tightly integrated with Whispersync (read position, notes)
  • Excellent text reflow and rendering quality on Kindle hardware
  • Backwards-compatible MOBI fallback for old Kindles

Limitations

  • Proprietary — Amazon-only ecosystem
  • DRM-protected by default for Kindle Store purchases
  • No native support outside Kindle apps (Kobo, Apple Books, etc.)
  • Cannot be read on most non-Amazon e-readers without conversion
  • Less flexible than EPUB3 for advanced layouts

When should you convert AZW3 files?

Convert AZW3 to EPUB to read on non-Kindle devices (Kobo, Apple Books, Google Play Books): use Calibre or any e-book converter. Convert AZW3 to PDF for printing or fixed-layout viewing. DRM-protected AZW3 cannot be converted without authorization — the conversion is only legal for DRM-free content (personal documents, sideloaded e-books).

Convert AZW3 files

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All FormatDrop conversions run entirely in your browser — no file upload, no server processing. Your files stay on your device.

AZW3 FAQ

What's the difference between AZW and AZW3?
AZW is the older Kindle format (essentially MOBI with Amazon DRM); AZW3 is the modern KF8 format with rich typography. Many Kindle book downloads are AZW3 even though Amazon's product pages may say 'AZW format'.
Can I read AZW3 on a Kobo?
Not directly. Kobo doesn't support AZW3. Convert to EPUB first using Calibre (only works for DRM-free AZW3). For DRM-protected Kindle purchases, you cannot legally read them on Kobo without DRM removal, which is illegal in most jurisdictions.
How do I send my own AZW3 files to my Kindle?
Email the AZW3 file as an attachment to your @kindle.com email address (find it in Amazon → Manage Your Content and Devices → Devices). Amazon delivers it to your Kindle Library wirelessly. The 'send to Kindle' service also accepts EPUB, PDF, and DOCX.

More formats

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