calibre 4.21.0

Calibre is a complete e-book library manager. Organize your collection, convert your books to multiple formats, and sync with all of your devices. Let Calibre be your multi-tasking digital librarian.

Manage, convert, sync, and more
  • Library management. Calibre keeps things orderly by creating single entries for books that contains multiple formats. Add tags and comments for better searchability.
  • Format conversion. Calibre’s robust conversion options support

What’s New

Version 4.21.0:

New features
  • Kobo driver: Add support for the new Kobo Nia
  • Cover grid: Vertically center covers that are smaller than the available space.
  • Quickview panel: Add a checkbox to easily toggle if virtual libraries are respected.
  • When creating custom columns allow specifying a default value to be applied to new books for that column
Bug fixes
    • Edit book: Fix initial sync of preview panel to cursor position sometimes not working when a new HTML file is opened for editing
    • Fix changed author sort name not being used when adding another book by the author to the library.
    • Cover browser: improve rendering of text with heavily hinted fonts.
    • Viewer: Fix CBC comic files not being viewed correctly. Note that you have to reload the book via the viewer controls to apply the fix.
    • Viewer: Fix Table of Contents not correct for comics.
    • Viewer: Ignore the zero width non-joiner character in searches
    • Viewer: Fix a regression in the previous release that broke reading of books with mathematics and also tags without href attributes.
Improved news sources
  • 1843 magazine
  • Caravan Magazine


OS X 10.9.5 or later, 64-bit processor


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