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 9.2.1 changelog:
New features
- ZIP Output: Change the template engine used for HTML templating from templite to Mustache, for greater safety and performance. Note that this is a breaking change if you use custom templates with ZIP output (CVE-2026-25731)
- Check library: Add an option to rebuild the annotations search index
Bug fixes
- CHM Input: Ignore internal files that have paths that end up outside the container. Prevents path traversal attacks with malicious CHM files (CVE-2026-25635)
- EPUB Input: Ensure font obfuscation processing happens only on files from the EPUB, preventing path traversal attacks from malicious EPUB files (CVE-2026-25636)
- Windows: Workaround for bug in Qt 6.10 causing Read Aloud in the E-book viewer to crash when stopped and restarted
- Fix drag and drop of books into bookshelf view not working
- Bookshelf: Fix bookshelf view blank on some macOS systems
- E-book viewer: Fix a regression in calibre 9.0 that broke the Go to page function
- E-book viewer: Fix google dictionary lookup results not legible
- E-book viewer: Fix PageUp/PageDown keys needing to be pressed repeatedly at internal HTML file boundaries in flow mode
- Bookshelf: Avoid rendering during initial show while the view is still being resized
- Fix a regression in calibre 9.0 that caused mouse wheel to scroll a full row at a time in the Cover grid
- News download: Fix a regression in 8.11 that broke automatic cleanup of downloaded HTML
- Version 9.2.1 prevents the Content server from using template based searches since this is insecure when the content server is used with un-authenticated users
Download: Calibre 9.2.1 | Portable | ~200.0 MB (Open Source)
Download: Calibre for MacOS | 323.0 MB
Download: Calibre for Linux
View: Calibre Home Page | Calibre Screenshot
