Calibre.online and the Calibre 2 mobile apps
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Which formats are supported? EPUB, MOBI, AZW3, PDF, HTML, Markdown and plain text.
Where are my books stored? On your device, unless you sign in — then they sync to your private account. See the Privacy Policy.
How do I delete my account? Open Account in the app and choose Delete account.
Can I share books? Yes — signed-in users can share individual books or whole libraries with specific people or their organisation.