Convert AZW3 to EPUB online for free.
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EPUB is the open ebook standard — reflows text, supports tables of contents and metadata, works on every e-reader except Kindle (which uses MOBI/AZW3 natively but converts EPUB on upload). Convert to EPUB when publishing to Apple Books, Kobo, Google Play Books, or shipping direct-to-reader PDFs / DOCX manuscripts.
Technical comparison of the two formats — useful for deciding which to use, or for confirming what changes during conversion.
| Property | AZW3 | EPUB |
|---|---|---|
| Full name | Kindle Format 8 | Electronic Publication |
| Year introduced | 2011 | 2007 |
| Developer / standard body | Amazon | W3C (formerly IDPF) |
| MIME type | application/vnd.amazon.ebook | application/epub+zip |
| File extension | .azw3 | .epub |
| Compression | Variable | ZIP-compressed XHTML + CSS |
| Color / data depth | N/A | N/A |
| Max dimensions / size | Software-limited | Software-limited |
| Transparency | No | No |
| Animation | No | No |
| Standard / specification | Amazon | W3C EPUB 3.3 / ISO/IEC 23736 |
| Best for | Modern Kindle devices — enhanced typography and layout | Apple Books, Kobo, Nook, Google Play Books — reflowable text |
AZW3, also known as Kindle Format 8 (KF8), is Amazon's modern ebook format introduced in 2011 as the successor to MOBI. Built on HTML5 and CSS3, AZW3 supports advanced typographic features including embedded fonts, drop caps, SVG graphics, fixed-layout pages, and responsive design that adapts to different Kindle screen sizes. It provides a significantly richer reading experience compared to the older MOBI format.
AZW3 is Amazon's proprietary format and only works on Kindle devices and Kindle reading apps. It takes full advantage of Kindle's enhanced typesetting engine, supporting features like X-Ray, Word Wise, and improved font rendering. AZW3 files use more efficient compression than MOBI, resulting in smaller file sizes. While AZW3 is the preferred format for sideloading content to modern Kindles, it cannot be read on other eReaders like Kobo, Nook, or Apple Books without first converting to EPUB.
Quick answers about compatibility, quality, metadata handling, and the most common reasons to convert AZW3 files to EPUB.
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