Calibre is an e-book library manager. It can view, convert and catalog e-books in most of the major e-book formats. It can also talk to many e-book reader devices. It can go out to the Internet and fetch metadata for your books. It has a cornucopia of features divided into the following main categories:

  • Library Management
  • E-book conversion
  • Syncing to e-book reader devices
  • Downloading news from the web and converting it into e-book form
  • Comprehensive e-book viewer
  • Content server for online access to your book collection

Is Calibre an e-book reader?

No, Calibre is an e-book manager in which you can organize existing e-books into virtual libraries, displaying, editing, creating and converting e-books, as well as syncing e-books with a variety of e-readers.

Can I write an e-book with Calibre?

Yes. Calibre can turn your personal documents to e-books or create them from scratch. It has automatic style helpers and scripts generating the book's structure.

Which devices does Calibre support?

Calibre is compatible with almost any e-reader, phone or tablet, as well as Windows, Mac and Linux devices. You can transfer your e-books from one device to another in seconds. Calibre will send the best file format for your device, converting it if needed, automatically.

What formats does Calibre support conversion to/from?

Calibre supports the conversion of many input formats to many output formats such as:

  • Input Formats: AZW, AZW3, AZW4, CBZ, CBR, CB7, CBC, CHM, DJVU, DOCX, EPUB, FB2, FBZ, HTML, HTMLZ, LIT, LRF, MOBI, ODT, PDF, PRC, PDB, PML, RB, RTF, SNB, TCR, TXT, TXTZ
  • Output Formats: AZW3, EPUB, DOCX, FB2, HTMLZ, OEB, LIT, LRF, MOBI, PDB, PMLZ, RB, PDF, RTF, SNB, TCR, TXT, TXTZ, ZIP.

Can Calibre read RSS feeds?

Yes, Calibre can deliver news to your device from hundreds of news sources or any RSS feed.

Does Calibre offer cloud storage for my library?

Calibre doesn't offer cloud storage, but it does integrate with most major cloud providers, including Google Drive, Dropbox, and OneDrive. This way, you can set up your eBook library in the cloud and access the content from your phone or tablet.

What's New

New features

  • A new option to keep the current search when switching Virtual libraries under Preferences->Searching. Closes tickets: 2151262
  • Pages column: Add support for accurate page counting of fixed layout EPUB files
  • Add from ISBN: Ignore space around the colon used to separate identifier type from value. Closes tickets: 2150806
  • Get books: Update and improve the WolneLektury store

Bug fixes

  • E-book viewer: Fix incorrect search match offsets in normal search mode when the text contains non-BMP Unicode characters. Closes tickets: 2152227
  • Content server: Apply null metadata when serving book files. Matches behavior of save to disk. Closes tickets: 2152879
  • Linux: Fix SSL certificate loading not working on Fedora 44
  • Bulk metadata dialog: Fix backspace key not working in number input boxes when set to Undefined

New news sources

  • Various Hungarian and Czech news sources by bubak
  • SuperInteressante by Pedro Henrique Souza

Improved news sources

  • Indian Express
  • Business Standard
  • BBC
  • New Criterion
  • Associated Press
  • Pro Publica
  • LA Times
  • Washington Post
  • New Yorker
  • TLS Magazine
  • Asian Review of Books
  • VOX
  • The Conversation
  • Chicago Tribune
  • New Republic Magazine
  • Indian Express
  • TIME Magazine