AZW3

AZW3 (also known as KF8 — Kindle Format 8) is Amazon's second-generation Kindle e-book format, introduced in 2011 to replace the older MOBI/AZW format. It adds support for HTML5 and CSS3 layout features, enabling more complex typography, drop caps, and multi-column text than its predecessor. Like all Kindle formats, AZW3 is a proprietary Amazon format and ebooks purchased from the Kindle Store are encrypted with DRM that ties them to the buyer's account.

File extensions	.azw3, .kfx
MIME type	application/vnd.amazon.mobi8-ebook
Developer	Amazon
First released	2011
Category	E-books
Open standard	No (proprietary)

What opens AZW3 files

• Amazon Kindle devices
• Kindle for PC / Mac / iOS / Android
• Calibre (with DRM removal for personal use)

Browse File Formats

Reference details for 53 file formats — extensions, MIME types, what opens each one, and how they convert.

7Z Archives ABW Documents AI Images AVIF Images AZW3 E-books BMP Images CSS Other CSV Spreadsheets DjVu E-books DOC Documents DOCX Documents EPS Images EPUB E-books FB2 E-books GIF Images GZ Archives HEIC Images HTML Documents ICO Images ISO Archives JPG Images JSON Other Keynote Presentations Markdown Documents MOBI E-books Numbers Spreadsheets ODP Presentations ODS Spreadsheets ODT Documents OTF Other Pages Documents PDF Documents PNG Images PPT Presentations PPTX Presentations PSD Images RAR Archives RAW Images RTF Documents SVG Images TAR Archives TeX / LaTeX Documents TIFF Images TSV Spreadsheets TTF Other TXT Documents WebP Images WOFF / WOFF2 Other WPD Documents XLS Spreadsheets XLSX Spreadsheets XML Documents ZIP Archives