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

  • Edit book: A new tool to create an audio overlay in EPUB files for all text using the Read aloud facility
  • This allows readers of the book to listen to it with sentence tracking, even if they do not have a functioning text-to-speech system in the reading software. You can even assign different voices to different parts of the text for a more immersive experience. The tool is available from the Tools menu in the book editor.
  • Dark mode: make scrollbar more visible with higher contrast and rounded corners
  • E-book viewer: In flow mode when scrolling across internal file boundaries using the mouse wheel/touchpad have a short half second pause to ease the transition. Can be controlled via the Scrolling section of the Viewer preferences.
  • ebook-meta.exe: Add an option to disallow rendered cover of first page for EPUB
  • Book details: Add an action to download the cover to the context menu when right clicking the cover. Closes tickets: 2082075
  • Read aloud: Add a restore defaults button to the configuration dialog. Closes tickets: 2086609
  • Auto adding: Allow excluding arbitrary file types not just known book file types. Closes tickets: 2086478
  • Edit metadata dialog: Add an action to open the book's folder to the context menu of the formats list. Closes tickets: 2083583

Bug fixes

  • Read aloud: Fix only first 32000 characters per chapter being read. Closes tickets: 2086571
  • Content server: Read aloud: Fix clicking on a word to skip reading aloud to that word causing word highlighting to stop working. Closes tickets: 2086661
  • Linux: Handle speech dispatcher with dummy output module and no voices more gracefully
  • When renaming authors fix empty author folder not being removed if it contained file explorer metadata but was otherwise empty
  • Edit metadata dialog: Fix keyboard shortcuts to edit prev/next raising an error when trying to go beyond the first/last book. Closes tickets: 2086193
  • Linux: ToC Editor: Fix a regression in 7.17 that broke using the Create new entry button. Closes tickets: 2085576
  • Content server: Fix changing the language of a book not working for non-English user interface language and for books that have no existing language. Closes tickets: 2085005
  • Linux: Read aloud with Piper: Fix audio not playing on some Linux systems
  • Notes browser: When searching books search over all currently selected categories not just the last selected one

New news sources

  • Unz Review and Sonar21 by unkn0wn

Improved news sources

  • Substack
  • Live Mint
  • NYPost
  • Ars Technica
  • Indian Express
  • Reuters