calibre

Release: 9.17 [23 Oct, 2026]
New features
Conversion: Add support for reading images in the JPEG XL format
Conversion: Add support for CSS Level 4 selectors
Edit book: Check book: Add a check for dangling ARIA references and update ARIA references when auto fixing invalid ids
Closes tickets: 2170895
MOBI/AZW3/PDB Output: Speed up compression, making conversion to these formats faster
Content server/E-book viewer: Honor the prefers-reduced-motion setting of the operating system
Speed up adding books and starting calibre in large libraries with the Tag browser hidden
Catalogs: Use calibre as the creator of generated catalogs and record the generation date as the publication date
Closes tickets: 2022353
Create your own Adventure: Improve the character selection screen
Bug fixes
PDF Input: Fix a regression in the previous release that broke conversion of some PDF files
Closes tickets: 2170990
EPUB 3 conversion: Fix a regression in the previous release that caused invalid navigation markup to be generated
Closes tickets: 2170400
Fix a regression in the previous release that caused non-breaking spaces to be converted to regular spaces in comments and text columns
Closes tickets: 2170595
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Release: 9.16 [09 Oct, 2026]
New features
Read aloud: Add the high quality Kokoro voices, which sound much more natural than the Piper voices, especially for English
To use them, select the Piper backend in the Read aloud configuration and choose one of the Kokoro voices. The voice will be automatically downloaded the first time it is used.
News download: Support for downloading news from websites that block automated access by using the camoufox browser
PDF Input: Support for right-to-left text and better handling of multi-column pages
Add support for reading images in the AVIF format
Tag browser: A new option to sort hierarchical tags that have only children but no actual books as folders, before all other tags at their level
Closes tickets: 2144044
Edit book: Check book: Allow skipping of problems of a particular type
Closes tickets: 2120771
Edit book: ToC View: Indicate what ToC entries, if any, are in the file being currently edited
Edit book: Check book: When auto fixing invalid ids also update CSS selectors
E-book viewer: Add an option to display the immediate parent ToC section in headers/footers
Closes tickets: 2169454
E-book viewer: Allow e-books to store up to 1MB of data persistently
Closes tickets: 2168471
E-book viewer: Print to PDF: Allow specifying margins in metric units
Closes tickets: 2148707
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Release: 9.15 [18 Sep, 2026]
New features
A "Create your own adventure" writing game -- interactive storytelling with an AI managing the world you create
E-book viewer: Highlights panel: Allow selecting multiple highlights and right clicking to change their style
Closes tickets: 2167215
Cover grid: Allow choosing which corner of the cover emblems are placed on in Preferences->Look & feel->Cover grid->Layout
Closes tickets: 2167194
E-book viewer: An optional button to add to the sidebar to easily switch between saved window sizes, add it by right clicking the sidebar and choosing customize
Closes tickets: 2166717
E-book viewer: When creating highlights with notes, show the notes as a tooltip when the mouse hovers over the highlights. Controlled via the setting to hide mouse over tooltips in the Miscellaneous section of the viewer preferences
Closes tickets: 2159668
A new CLI flag to add and delete a book from a specified path in the system temp dir when running calibre.exe
Bug fixes
E-book viewer: Fix Read Aloud stopping at some full screen images
Closes tickets: 2165923
E-book viewer: In flow mode when using Read Aloud be more robust about keeping the selected text visible
Closes tickets: 2165439
Edit book: fix a regression that caused an error when using the test box in the snippets dialog
Edit book: Preferences: Fix moving and deleting toolbar icons from plugins not working
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Release: 9.14 [28 Aug, 2026]
New features
Allow generating book covers using AI with different cover styles such as romance, sci-fi, pulp fiction etc.
To use it select a book and click Edit metadata and then the "AI Generate" button. Note that you will have to configure an image generating AI provider the first time you use this feature.
Edit book: File browser: When hovering the mouse over an image file show a floating preview of the image next to the file browser
Tags editor: have searching ignore accents
Closes tickets: 2164853
AI: Add Anthropic and Grok backends for Claude and Grok models
AI: Remove GitHub backend as service has been discontinued
Closes tickets: 2163567
Edit metadata dialog: Always scale up cover preview to fill available space while maintaining aspect ratio
Bug fixes
Content server: OPDS: Fix a regression that caused first line of comments to be missing
Closes tickets: 2165075
Undo delete books: Show a progress bar when more than five books have to be undeleted
Closes tickets: 2164811
Linux: Binary builds: Fix hyperlinks in labels not working on some Linux systems
Closes tickets: 2164584
Get books: Fix a regression that broke show in store
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Release: 9.13 [07 Aug, 2026]
Bug fixes
PDF Output: Fix a regression in calibre 9 which caused links in PDF to scroll to a target location minus the top margin, thus ending up a few lines above the target
Content server: Fix an error when uploading a data file to a book with no existing data files
Closes tickets: 2162628
Content server: Fix a regression in the previous release that broke searching in the builtin viewer
Closes tickets: 2162644
Content server: Fix a regression in the previous release that caused the conversion options sections to be missing
Closes tickets: 2162647
Book details panel: Fix a regression in the previous release that broke drag and drop of covers
Closes tickets: 2162711
Windows: Fix a crash caused by some third party plugins trying to send notifications in non-GUI threads
Closes tickets: 2162935
Bulk metadata dialog: Fix a regression in the previous release that caused the yes/no buttons to be hidden for Yes/No column edit controls
Closes tickets: 2162638
Edit book: Compress Images: Fix error when converting GIF to JPEG on Windows
Linux: Preload html5-parser to avoid errors on systems that ship ancient libxml2 when converting to PDF
Improved news sources
Nautilus Magazine
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Release: 9.12 [31 Jul, 2026]
New features
macOS: Add sharing of books via AirDop to the Connect/Share button
Content server: Add support for plugins that can add new endpoints to the server backend
Edit book: Compress images: Add an option to convert GIF images to JPEG/WebP
ToC Editor: Add a button to sort the entries in the Table of Contents
Closes tickets: 2161171
Content server: OPDS: Add kind metadata to feed links
Closes tickets: 2161117
Kobo driver: Add support for latest Tolino firmware
Bug fixes
E-book viewer: Fix an issue causing text area width to change when using section titles in header/footers and the text is too long to fit in the space
Closes tickets: 2160341
When adding books via calibre.exe fix --with-library not working. Now calibre will switch to the specified library and only then add the book
Closes tickets: 2162073
When evaluating recursive templates inherit python template policy
Fix inability to input more than ~30K characters in custom tag like columns
Closes tickets: 2161833
Fix some menu separators not rendering on some systems with high res monitors
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Release: 9.11 [02 Jul, 2026]
New features
Allow exporting annotations in the HTML format as a standalone web page that can be viewed in any browser with support for light/dark themes, searching and filtering by highlight style
E-book viewer: Ask AI: Allow using the {selected} placeholder when typing free form queries to the AI as well
Bug fixes
E-book viewer: Fix text area not always resizing correctly when window is resized when the scrollbar is enabled
Fix a regression in the previous release that broke python templates in the book details panel
Fix a regression in the previous release that caused default values for custom columns to not be used when adding new books
Improved news sources
Scientific American
Phoronix
Allow exporting annotations in the HTML format as a standalone web page that can be viewed in any browser with support for light/dark themes, searching and filtering by highlight style [9.11]

Release: 9.10 [25 Jun, 2026]
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
Closes tickets: 2156386
CSS parsing: Add support for CSS Level 4 selectors
Closes tickets: 2156213
Cover grid: When using an image larger than the viewport as a texture scale it to fit the viewport
Closes tickets: 2154669
Annotations browser: Allow restricting displayed annotations by custom annotation styles as well
Closes tickets: 2154593
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
Closes tickets: 2049604
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
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Release: 9.9 [28 May, 2026]
New features
A new option to keep the current search when switching Virtual libraries under Preferences->Searching
Closes tickets: 2151262
Pages column: Add support for accurate page counting of fixed layout EPUB files
Add from ISBN: Ignore space around the colon used to separate identifier type from value
Closes tickets: 2150806
Get books: Update and improve the WolneLektury store
Bug fixes
E-book viewer: Fix incorrect search match offsets in normal search mode when the text contains non-BMP Unicode characters
Closes tickets: 2152227
Content server: Apply null metadata when serving book files. Matches behavior of save to disk
Closes tickets: 2152879
Linux: Fix SSL certificate loading not working on Fedora 44
Bulk metadata dialog: Fix backspace key not working in number input boxes when set to Undefined
New news sources
Various Hungarian and Czech news sources by bubak
SuperInteressante by Pedro Henrique Souza
Improved news sources
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Release: 9.8 [01 May, 2026]
New features
Content server: In the /mobile view allow clicking on book titles/covers to see book details
Edit book: Allow reset of zoom to 100% by right clicking in the preview panel
macOS Tahoe: Have the calibre app icon automatically use a dark look when the system is in dark mode
AI: Support for arbitrary local providers that export an OpenAI compatible interface
Bug fixes
Native TTS engine: Normalize text to NFKC so that word tracking works when the native engine reports spoken word with different normal form
When converting GIF images to PNG workaround bug in PIL causing exception when checking if the GIF is animated
Closes tickets: 2148533
Preserve existing conversation with AI when there is an error talking to it
Improved news sources
Hacker News
The Atlantic
Scientific American
Mediapart
Hindu

Release: 9.7 [10 Apr, 2026]
New features
Annotations browser: Allow grouping results by any field
E-book viewer: Handle native pinch to zoom gesture on touchpads the same as the pinch to zoom on touchscreens. Default action is to change font size.
Content server: Implement full offline mode when using HTTPS connections to the content server
Bug fixes
E-book viewer: Fix a regression in the previous release that caused annotations/last read information to not be saved in e-book files
Closes tickets: 2146912
AI: Make the GitHub backend a bit more robust
Closes tickets: 2147495
AI: OpenRouter backend: Fix reasoning level "auto" disabling all reasoning
Closes tickets: 2147008
Content server: Read book: Fix regression causing error during searching
Closes tickets: 2147261
Content server: Fix opening results from full text search not working
Closes tickets: 2146829
Fix a couple of minor regress in the new Full text search view introduced in the previous release
MTP driver: Linux: Fix a rare crash when connecting devices with large collections
Fix cover not being set when adding files to existing book records with no cover
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