EPUB to AZW3 Converter
Convert EPUB to AZW3 online for Kindle devices and apps. Keep chapters, book details, text, and supported images in a modern Kindle format.
Drop your EPUB files here
Up to 50MB per file.
Conversion Settings
Automatic is best for most books.
Book details and layout
Files are encrypted and auto-deleted after conversion
How to Convert
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Upload your EPUB files
Drag and drop or select EPUB files from your device. You can upload multiple files at once.
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Choose book settings
Use Automatic for a broadly compatible result, or choose a reading device. Book title, author, margins, and text size are available under Book details and layout.
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Download AZW3 files
Download the converted AZW3 ebook, or collect completed batch conversions in a ZIP.
Why convert EPUB to AZW3?
AZW3 makes the book suitable for the devices and reading apps that use that format while carrying across chapters, text, supported images, and available book details.
Automatic settings work for most books. A reading-device profile plus optional title, author, margins, and text size are available when you want more control.
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View all ebook convertersFrequently Asked Questions
Is this conversion safe?
Yes. Your files are uploaded over an encrypted connection, processed securely, and automatically deleted shortly after conversion.
Will I lose quality?
You can control the output quality with the quality slider. Higher settings preserve more detail at the cost of larger file sizes.
Can I batch convert?
Yes! You can upload multiple EPUB files at once and convert them all to AZW3 simultaneously. Download them individually or as a ZIP archive.
Is there a file size limit?
Files can currently be up to 50MB.
Why convert EPUB to AZW3?
Converting EPUB to AZW3 gives you broader compatibility and flexibility. AZW3 may offer better compression, wider software support, or features like transparency that EPUB doesn't support.