Calibre 9.14 was released today as the most recent update to the widely popular open-source e-book management software, introducing a new AI-powered book cover generator, expanded AI provider support, usability improvements, and numerous bug and security fixes.
The headline addition is the ability to generate book covers directly from Calibre using an image-generating AI service. Users can choose from different visual styles, including romance, science fiction, and pulp fiction.
The feature is available by selecting a book, opening “Edit metadata,” and clicking the new “AI Generate” button. The first time it is used, Calibre requires configuring an image-generation provider.
At the same time, Calibre 9.14 expands the AI services it can work with. Anthropic and Grok backends have been added, allowing Claude and Grok models to be used with Calibre’s existing AI functionality. The GitHub backend, meanwhile, has been removed because the corresponding service has been discontinued.
This update also includes a few smaller interface improvements. In the book editor’s file browser, hovering over an image file now shows a floating preview alongside the file list. Searching in the Tags editor ignores accents, and the Edit metadata dialog has a visual tweak. Cover previews now always scale up to use available space while preserving their original aspect ratio.
Beyond the new features, Calibre 9.14 fixes multiple issues in the Content Server, including arbitrary file-write vulnerabilities and a remote code execution flaw affecting authenticated users. A cross-site scripting vulnerability in the legacy book details page is also addressed.
Additional hardening restricts FB2 input handling to known FB2 namespaces to prevent arbitrary file writes. MOBI output’s PalmDOC compression is now more robust when processing specially crafted input.
Among regular bug fixes, the Content Server’s OPDS implementation no longer drops the first line of book comments. Calibre now displays a progress bar when restoring more than five deleted books.
Linux users get a fix for hyperlinks in labels that did not work in Calibre’s binary builds on some systems. Another regression that prevented “Show in store” from working correctly in the Get books feature is resolved.
Several regressions introduced with Calibre 9.11 are fixed, including one that prevented configuring the Folder device driver and another that affected metadata extraction from HTML files in builds using Python runtime assertions. The Google AI configuration dialog again displays the checkbox to enable search grounding.
Finally, Calibre 9.14 adds The Golfer’s Journal as a new built-in news source. Existing recipes for Pagina12, The Week, Nautilus, Smithsonian Magazine, FAZ.net, and Daily Mail have also been updated.
For additional details, see the announcement. Calibre 9.14 is available for Windows, macOS, and Linux.