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

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
Some news sites, such as The New York Times, The Economist and The Atlantic, block all lighter weight ways of fetching their pages. Recipes for these sites now use the camoufox browser, which is automatically downloaded the first time such a recipe is run. Recipe authors can use it by setting browser_type = 'camoufox' in their recipes.

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

Tag mapper and HTML/CSS transform rules: Add the ability to search the rules
Closes tickets: 2150408

Allow removing individual entries from the search history dropdown
Closes tickets: 2167642

Add a button to Preferences->Look & feel->Main interface to reset the main window layout
Create your own Adventure: Allow exporting and importing saved games
Speed up various operations on large libraries, such as startup, deleting many books, sorting by series, searching and refreshing the Tag browser
Kobo driver: Add support for newer firmware
Closes tickets: 2168472

Windows: Unregister calibre from default programs and clear its caches when uninstalling
DOCX Output: Make images inside links clickable
Bug fixes

EPUB 3 to EPUB 3 conversions: Preserve ids on nav elements so links to them continue to work
Closes tickets: 2169441

PDF Output: Fix some trailing content at the end of individual HTML files being lost when the files use multi column layout
Closes tickets: 2142731

PDF Output: Fix a regression in 9.x that caused conversion of some books with vertical writing to not work correctly
Closes tickets: 2146979

DOCX Output: Fix non-breaking spaces not being preserved
Closes tickets: 2167710

FB2 metadata: Clear series, comments, etc. from the file when they are cleared in calibre
Closes tickets: 2168996

E-book viewer: Fix dark mode theme color overrides conflicting with e-book CSS when the book uses filters to change image colors in dark mode
E-book viewer: Update the "Pages from paper edition" value faster
Closes tickets: 2169232

E-book viewer: Fix an error when pressing ctrl+shift
Closes tickets: 2169575

Layout actions: Fix saving/restoring layout not restoring which of the alternate book list visualisations is currently active
Closes tickets: 2136805

Book list: Respect horizontal alignment setting for all icon only column types
Closes tickets: 2168620

Cover grid: Fix one cover being rendered too small in some circumstances
Content server: Various fixes for older browsers when using the book details page in the /mobile view
Content server: Various security hardening fixes
New news sources

World Socialist by Paulb223
Poetry Magazine by flurbs
The Believer by flurbs
Respekt by Vector Rilke
Improved news sources

The New York Times
The Economist (needs subscription)
The Atlantic
Reuters
Heise
La Jornada
Naked Capitalism
The Saturday Paper

There is no option to change the default location of the Calibre library in the built-in UI, but you can edit the config file to do this.

Calibre stores its default library path in global.py.json. You can change it directly:

Go to Windows: %APPDATA%\Roaming\calibre\global.py.json

"library_path": "C:\\Books\\Library",

Change the path to your new library location

How do you manage the same book with different editions in Calibre? (Like US, UK, Illustrated, Portuguese Translated, ...)

I think they should all belong to the same folder, but that's not how Calibre works. Is there any way to keep books organized after "Save to Disk"? (I use Kavita)

Hi everyone! I bought some books from the Kobo store and they come with Adobe's DRM (ADE). I tried using the noDRM plugin (10.0.10 and some other fork 10.0.20) with the latest version of Calibre, but it didn't do anything. Then I tried downgrading to something like 8.7, still the same. Downgrading even further resulted in some Python versions mismatch and I couldn't be bothered to resolve it. Trying oboK threw errors because it needs (?) the Kobo desktop program. Trying the ACSM plugin seemed promissing as it was able to create an anonymized ID, but importing the files yet again didn't do anything... No errors, nothing.
Is there anythign else I could attemp besides booting into Windows?
Thanks!

New features

Full text search: A new cards based view of full text search results with book covers
To perform a full text search, click the "FT" button on the left of the search bar. The old compact result view can be re-activated by clicking the button to the left of the search bar in the Full text search window.

A new "word-prefix" completion mode that shows matches that have any word starting with the typed in letters
Closes tickets: 2144422

Bookshelves: Add option to have the height of books be constant per group
Edit book: File list: Allow using Ctrl+Left/Right to move an item to top/bottom of the list
Bug fixes

Fix notes being lost when changing the lookup name of custom column
Closes tickets: 2146404

E-book viewer: Fix using the slower/faster buttons causing a chapter skip when using the Piper neural speech backend
Content server viewer: Fix annotations being not synced to the server in some Android devices when using the Firefox browser
Windows: Force kill calibre.exe on quit to workaround hang in interpreter shutdown on some systems
TXT Output: Fix asciiize option not applying to generated inline Table of Contents
E-book viewer: Disallow background images from the internet. This was an unused feature anyway (CVE-2026-33205)
TXT Input: Ensure resource files are read only from book contents (CVE-2026-33206)
Only apply changes to text fields in the book list when the new value is different from the old
Closes tickets: 2144489

Completions: Update list of completion suggestions when cursor is moved
Closes tickets: 2144486

New news sources

L'Humanite by Kabonix
Telerama by Kabonix
Le Parisien by Kabonix
Improved news sources

BusinessLine
Naked Capitalism
Le Canard Enchaine
Le Monde
Courrier International
L'Equipe by Kabonix

New features

E-book viewer: Add "reading stats" to show reading progress
Closes tickets: 2142715

Edit book: Nicer UI for changing the entries in the insert tag menu
Cover grid: Option to draw emblems on top of cover in Preferences->Look & feel->Cover grid->Emblems
Cover grid: Add option to draw text flush with bottom of rendered cover
Bug fixes

DOCX Input: Fix paragraph/list margins in documents created by LibreOffice that do not have Word 2007 compatibility
Closes tickets: 2142611

ODT Input: Fix a regression in the previous release that broke conversion of images
Closes tickets: 2142345

Content server: When banning IPs for repeated login is enabled, only use the IP address not any HTTP headers as the ban key (CVE-2026-27824)
Content server: Sanitize content disposition received as query parameter (CVE-2026-27810)
Improved news sources

WIRED Daily
TOI Print Edition

The official source code repository for the calibre ebook manager - Release version 9.3.1 · kovidgoyal/calibre

The official source code repository for the calibre ebook manager - Release version 9.0.0 · kovidgoyal/calibre

Source: https://calibre-ebook.com/whats-new

New features

• E-book viewer: Improve display of Lookup results from Google
• Kobo driver: Add support for latest Tolino firmware
• Conversion: Handle -epub-text-emphasis properties used in some Japanese language EPUB books
• Piper Neural text to speech engine: re-write the backend used to run the Piper speech models to no longer need an external binary for improved performance and robustness. Closes tickets: 2117433

Bug fixes

• Edit book: Reports: Fix sorting by name of CSS rules
• Fix template based custom column of tags type not being treated as multi valued when using it for similarity searches. Closes tickets: 2118744
• When adding books recursively do not try to import folder whose names named with an ebook file extension. These are, for example, generated by Apple Books
• EPUB3 Output: Fix various issues with processing nav files when they contain more than just the Table of Contents and are not included in the spine. Closes tickets: 2117255, 2117336

Improved news sources

• Economist
• Press Information Bureau
• Indian Express
• Wall Street Journal
• De Tijd
• Washington Post