
Kindleunpack: extract and modify kindle ebook files
Kindleunpack extracts mobi, azw3, and kfx files into editable html, images, and metadata — essential for ebook repair and customization.
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Kindleunpack extracts mobi, azw3, and kfx files into editable html, images, and metadata — essential for ebook repair and customization.

Kindlegen converts html/css to kindle format. though discontinued, it's still the best tool for creating standards-compliant kindle ebooks.