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

  • PDF Input: Automatic header/footer detection and removal
  • A new, dedicated PDF Input engine for calibre that implements automatic detection of headers and footers based on document analysis. The new engine is the default to go back to using the old engine, select it in the PDF Input section of the Conversion dialog.
  • Read Aloud: Allow configuring an extra pause at the end of every sentence when using the Piper TTS engine. Closes tickets: 2083058
  • PDF Output: Add _WIDTH_PIXELS_ and _HEIGHT_PIXELS_ variables to know the width and height of the header/footer area in templates
  • Windows: Use calibre's bundled SSL certificates instead of the system certificate store by default
  • Can be turned off via CALIBRE_USE_SYSTEM_CERTIFICATES=1 env var
  • Trim image tool: Add a control to adjust aspect ratio
  • Kobo driver: Add support for the new firmware used by the Tolino Shine 5

Bug fixes

  • Fix a regression in previous release that broke copying of book to another library if the books author does not exist in the destination database
  • Read aloud: Piper backend: Fix not working with voices whose names have non-ASCII characters on Windows.
  • Content server: Fix book with non-ASCII filenames not downloading in the Kindle browser when using the /mobile view
  • Content server: Fix embedding the server HTML inside a third party iframe causing an error

New news sources

  • NYT Magazine by unkn0wn
  • RedaktionsNetzwerk Deutschland by epubli

Improved news sources

  • The Wire
  • Nikkei Asia Magazine
  • Swarajya
  • Mainichi
  • Nautilus
  • National Geographic
  • Science Journal
  • Times Literary Supplement
  • Saechsische Zeitung
  • India Today
  • Scientific American