Calibre 8.9.0

Open source e-book library management application that enables you to manage your e-book collection, convert e-books between different formats, synchronize with e-book reader devices

Razvan Serea News Reporter Neowin · Aug 22, 2025 03:28 EDT with 0 comments

Calibre

Calibre is an open source e-book library management application that enables you to manage your e-book collection, convert e-books between different formats, synchronize with popular e-book reader devices, and read your e-books with the included viewer.

It acts as an e-library and also allows for format conversion, news feeds to e-book conversion, as well as e-book reader sync features and an integrated e-book viewer.

Calibre's features include: library management; format conversion (all major ebook formats); syncing to e-book reader devices; fetching news from the Web and converting it into ebook form; viewing many different e-book formats, giving you access to your book collection over the internet using just a browser.

Calibre 8.9 changelog:

New features

Annotations browser: Add a color swatch in the results list to make seeing the type of highlight easier
Match books in library window: When doing the initial search using the title of the book on the device, if no matches are found remove trailing text in parentheses or after a colon and try again
When merging books via drag and drop show the cover of the target book
HTMLZ Output: Add support for embedded fonts
Plugin installation window: Allow filtering available plugins by category
Fetch news: Add a sub-menu to the right click menu of the Fetch news button that shows recently downloaded news sources

Bug fixes

Edit book: When pasting text from the clipboard ensure it is normalized to NFC form
Content server viewer: Improve the selection dialog for choosing a Text-to-speech voice
Content server: Fix an error when editing a book's metadata to change both the cover and another field

New news sources