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 9.10 changelog:
New features
- Content server: A new "modern" interface with a sidebar to ease navigation
- Content server: When used with HTTPS allow installation as a PWA (Progressive Web App)
- Edit book: Saved searches: When filtering the list of saved searches match by keywords
- CSS parsing: Add support for CSS Level 4 selectors
- Cover grid: When using an image larger than the viewport as a texture scale it to fit the viewport
- Annotations browser: Allow restricting displayed annotations by custom annotation styles as well
- Edit book: Compress images: Add option to convert PNG images to JPEG or WEBP
Bug fixes
- E-book viewer: Fix IME on Windows not working when typing in notes for highlights
- Conversion: Heuristics: Improve performance in some pathological cases
- SNB Input: Fix error on some input files
- Windows: fix rare crash when too many notifications are displayed at once
- Fix duplicating of books not duplicating value from enumerated columns when the column has a default value defined
- Fix a regression in 9.8 that caused errors from AI plugin providers to be silently swallowed and not displayed to user
- Fix CSV export invalid when exporting comments field
- Disallow Python templates when reading book metadata (CVE-2026-53511)
Improved news sources
- The Week
- Economist Espresso
- Horizons
Download: Calibre 9.10 | Portable | ~200.0 MB (Open Source)
Download: Calibre for MacOS | 327.0 MB
Download: Calibre for Linux
View: Calibre Home Page | Calibre Screenshot
