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

What's New

New features

  • E-book viewer: Allow searching for nearby words using a new "Nearby words" search mode
  • calibredb: New fts_search and fts_index commands to perform full text searching from the command line
  • Image viewing popup: Allow zooming using the standard shortcuts of Ctrl+plus/minus. Closes tickets: 1985021

Bug fixes

  • Fix a regression in calibre 6.0 that broke remembering the previous sort order for a column
  • Fix a regression in calibre 6.0 that broke processing of very high resolution images. Closes tickets: 1983484
  • Full text search: Fix error when using restrict searched books and more than 900 books are present in the searched list. Closes tickets: 1983230
  • E-book viewer: Fix parsing of CSS styles with @supports rules not working
  • E-book viewer: Speed up initial render of books with lots of CSS in <style> tags by not prettying the CSS
  • Google books metadata download: Fix paragraphs not being recognized. Closes tickets: 1983126
  • Content server: Fix light background for comments editor in dark mode
  • Content server: Fix margin and body background color mismatch when reading books with a non-white/black color scheme. Closes tickets: 1985058
  • Content server: Fix long tapping in the notes edit area incorrectly changing the highlight extent. Closes tickets: 1983271
  • Google search engine: Fix for different URL encoding used by Google servers in Portugal
  • Check library: Fix vacuum not running on FTS db

New news sources

  • Various Russian and Ukranian news sources by bugmen00t

Improved news sources

  • Wirtschaft Woche
  • Scientific American
  • Popular Science
  • Mediapart
  • MIT Technology Review
  • Indian Express
  • Eenadu