Compare Amazon Kindle Format 8 and Electronic Publication formats — understand the key differences and when to use each
Amazon Kindle Format 8
Amazon Kindle Format 8 (.azw3) is a ebook file format.
Electronic Publication
EPUB (Electronic Publication) is the open standard for digital eBooks, maintained by the W3C. EPUB uses HTML/CSS for content rendering, making eBooks reflowable — text automatically adapts to different screen sizes, font preferences, and reading orientations. EPUB 3 supports fixed-layout pages, multimedia (audio, video), MathML, SVG graphics, JavaScript interactivity, and accessibility features (WCAG compliance, screen reader support). The format is supported by Apple Books, Google Play Books, Kobo, Nook, Calibre, and most e-reader apps (but not Amazon Kindle, which uses its own formats). EPUB files are essentially ZIP archives containing XHTML content, CSS stylesheets, images, and metadata. Converting to EPUB is essential for publishing digital books across the widest range of platforms and devices.
| Feature | AZW3 | EPUB |
|---|---|---|
| Full Name | Amazon Kindle Format 8 | Electronic Publication |
| File Extension | .azw3 | .epub |
| Category | ebook | ebook |
| Free to Convert | ✓ Yes | ✓ Yes |
| Browser Support | ✓ All Browsers | ✓ All Browsers |
| Convert to Each Other | ✓ Yes | ✓ Yes |
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