Convert AZW to EPUB — Free Online Converter
Convert Amazon Kindle Format (.azw) to Electronic Publication (.epub) online for free. Fast, secure document conversion with no watermarks or registration.
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How to Convert
Upload your .azw file by dragging it into the upload area or clicking to browse.
Choose your output settings. The default settings work great for most files.
Click Convert and download your .epub file when it's ready.
About AZW to EPUB Conversion
AZW is Amazon's original Kindle ebook format, wrapping Mobipocket-based HTML content with Amazon's proprietary DRM and metadata structure. AZW files are locked into the Amazon Kindle ecosystem — they cannot be opened by Apple Books, Kobo, Google Play Books, or any non-Amazon e-reader. EPUB (Electronic Publication) is the open international standard for ebooks, supported by virtually every reading platform and device outside Amazon's ecosystem.
Converting AZW to EPUB liberates ebook content from Amazon's proprietary format, making it readable on any e-reader, tablet, or phone running non-Amazon reading software. This is the essential format migration for readers who want their ebook library accessible across all devices and platforms.
Why Convert AZW to EPUB?
AZW files are Amazon-only. They cannot be read on Kobo e-readers, Apple Books, Google Play Books, Nook, or any reading app outside the Kindle ecosystem. For readers who own non-Kindle devices or who want platform-independent ebook libraries, converting AZW to EPUB is necessary for cross-platform access.
For publishers and authors, converting AZW backlists to EPUB opens distribution to every non-Amazon ebook retailer and library system. Public libraries use EPUB for digital lending through Libby/OverDrive. EPUB is also an ISO-recognized standard with long-term archival guarantees that proprietary AZW format cannot provide.
Common Use Cases
- Convert personal AZW ebook collections for reading on Apple Books, Kobo, or Google Play Books
- Transform AZW backlist titles into EPUB for distribution through non-Amazon ebook retailers
- Convert AZW files to EPUB for library digital lending systems requiring the open standard
- Migrate AZW ebooks to EPUB for long-term preservation in an ISO-standardized format
- Convert AZW documentation to EPUB for cross-platform reading on any e-reader or app
How It Works
Calibre parses the AZW file's Mobipocket container, extracting HTML content records, image data, and header metadata (title, author, language, description, cover image). The HTML content is cleaned and converted to valid XHTML for EPUB packaging. CSS styles from inline formatting are preserved as EPUB stylesheets. Images are extracted and stored in the EPUB media directory. Calibre generates the required EPUB 3 structure: mimetype, META-INF/container.xml, content.opf, nav.xhtml, and XHTML content files for each chapter.
Quality & Performance
Text content, chapter structure, basic formatting (bold, italic, headings, lists), and images transfer cleanly from AZW to EPUB. The conversion is generally high-fidelity because both formats use HTML as their content layer — the transformation is primarily a container change. Cover images, table of contents, and metadata all transfer. The EPUB output typically provides a better reading experience than the original AZW due to EPUB's richer CSS support.
Device Compatibility
| Device | AZW | EPUB |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No |
Tips for Best Results
- 1Validate the output EPUB with EPUB Check if you plan to submit it to ebook retail platforms
- 2Review the table of contents — regenerated TOC may need minor adjustments for complex books
- 3Check cover image quality — AZW cover images may be lower resolution than EPUB store requirements
- 4After conversion, edit metadata in Calibre for proper author, description, and category information
- 5For best results, start with a clean AZW source — poorly formatted files produce equally poor output
Related Conversions
AZW-to-EPUB conversion frees ebook content from Amazon's proprietary ecosystem, enabling universal e-reader compatibility and long-term digital preservation in the open EPUB standard.