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

I've just converted a PDF to epub in calibre but because the PDF has two columns of text on each page the ouput epub is essentially 'combing' all the lines ton the PDF's page together, making the epub very hard to read.

How do I make Calibre feed one column at a time from each page into the conversion?

Hope that makes sense and thanks!

So I just started using calibre on my tablet pc. I have an issue where any italicized text is put in a block with a background the same color of the body. I'm assuming this has a greater z-index so it blocks the text above and below any italicized text.

I have installed the opens-dyslexic font and am using it and it really does help. Even if it looks a little comic sans like. Pretty sure its not the font causing this and its a bg color being applied to the italicized text with a greater z-index than the body at least that what it looks like. I have used CSS since its adoption but I really hate it! I don't do any real work with it anymore.

So I was wondering if there was a general easy way to download styles and hopefully apply them to all books? It would really suck to have to find issues in css and fix them per book just to be able to read.

First book was styled nicely. Maybe there wasn't any italic in the text though.

Using the latest Calibre
OS: arch
DE: kde
On a MS Surface Pro 9

Side issue, the calibre main interface is kind of touch unfriendly in that I cant open books without the stylus or a mouse. Is that an issue for any one else? Every other part of the UI works pretty flawlessly with a finger.

Any advice is appreciated.

cross-posted from: https://lemmy.dbzer0.com/post/40762255

Cross-posted from "Calibre subreddit succumbs to (probable) pressure and removes a thread discussing a fully legal way of bypassing an e-book DRM solution (LCP) created by a particularly litigious organization" by @[email protected] in ![email protected]

---

Sorry for the long title. Some context to this: Readium LCP is a DRM-solution created and delivered by the non-profit foundation EDRLab (I guess we've learned by now that non-profit doesn't equal good), based in France.

EDRLab is an international, non-profit development laboratory working on the deployment of an open, interoperable and accessible digital publishing ecosystem worldwide.

In recent years they've gained a large market share in the EU first and foremost, providing both regular e-book shops in many EU countries and libraries with this DRM (if you're interested in some more technical information regarding this DRM solution, I'd recommend reading Terence's previous blog post). What's particular to this solution is that they've historically been very litigious about any attempts to DeDRM it. The most famous plugin for DeDRMing books in Calibre (mainly Adobe DRM) has been the NoDRM plugin, and they did release a DeDRM solution to LCP v1.0 but they were threatened with legal action with a DMCA takedown request (read more on Github).

In recent days, Terence Eden posted a fully legal solution on his blog on how to bypass their DRM. This was also posted to the /r/Calibre subreddit, see the following image: I also made a thread on Lemmy here.

Nonetheless, after around a day the thread was removed on the Calibre subreddit. The only rule I could find that maybe could be applied to this (if it was illegal, and if Terence did this with any other material that wasn't his own) is the rule against piracy. But it feels weird.

This subreddit has previously allowed, and still allow, discussions around the NoDRM plugin and how to DeDRM the Adobe DRM. What makes this fully legal solution of bypassing LCP any different? It can probably be deduced that the EDRLab foundation contacted the subreddits moderators, or reddit admins, and "threatened" them in order to have it taken down. Or guilt tripped them as they also did towards Terence. Aside from their previous DMCA takedown request to the NoDRM people, just look at their arrogant correspondence towards Terence (more in his blog post). Threatening him on no legal basis as well as somehow blaming their failure on developing accessibility tools to him posting about this solution:

"We were planning to now focus on new accessibility features on our open-source Thorium Reader, better access to annotations for blind users and an advanced reading mode for dyslexic people. Too bad; disturbances around LCP will force us to focus on a new round of security measures, ensuring the technology stays useful for ebook lending (stop reading after some time) and as a protection against oversharing."

These are some of the reasons why I think a federated web will be necessary moving forth. I really dislike DRM, but also these methods that DRM organizations use in order to control the conversation. Thanks for reading and engaging with my small fixation on DRM and especially LCP :)

Hi, is there any way to sync devices directly to Calibre server? I would like to keep the database on a server and sync directly from there. This would allow to leave out syncinc the library to a laptop first. Thanks for your support!

I manage my ebooks locally and then upload them to my calibre-web container via the webui. It's there an easier way to do this? I no longer use a shared backend storage for fear of corruption/loss so i was looking for an easier way (export plug-in?). Any one have any ideas?

I use the page count plugin plus a template program I adapted from one found online (included below) to build a column that categorizes books by length. (I use this to build collections I use when I’m picking my next to read)

I’d like to exclude certain books from getting a classification though if they are PDFs or have tags like “Graphic Novel” or “Cookbook”. I’d appreciate any help figuring this out.

program:
val = field('#pagecount');
first_non_empty(
	cmp(val, 0, ' ', '', ''),
	cmp(val, 15, 'Flash Fiction', '', ''),
	cmp(val, 50, 'Short Story', '', ''),
	cmp(val, 100, 'Novelette', '', ''),
	cmp(val, 250, 'Novella', '', ''),
	cmp(val, 500, 'Short Novel', '', ''),
	cmp(val, 750, 'Long Novel', '', ''),	
	cmp(val, 1000, 'Tome', '', ''),
	'Toe Breaker');

I frequently use Calibre to convert academic papers from PDF to epub, so I can read them on my tablet. But the conversion often results in weird formatting artifacts.

I'm aware that in the Conversion tool, there's a Search & Replace section, where I can list various expressions that will help me remove things like page numbers. This post has some helpful expressions for that. For example:

\d+<br>\n|\d+\w<br>\n|\w\d+<br>\n

Does anyone have a list of more expressions that they use when converting academic papers from PDF to epub? Especially any good expressions for handling footnotes?? I would love to get a bunch together, save them, and then simply load them every time I have to do this.

Thanks all!

A bit of a long shot, but I guess it doesn't hurt asking.

I'm using Calibre with the library on a network share (I'm aware this is not recommended, however I'm using this for years without any problems on Windows and Mac OS). Recently I gave Linux another shot and I stumbled upon a problem with accessing my network share.

When trying to add this library which is sitting on the network share, the Calibre file explorer doesn't show the network locations I added in Dolphin in the "Remote" tab. Is there any way to convince Calibre to find these network locations without adding the shares in /etc/fstab?

Edited meta in Calibre doesn't stick with the epub file. Is there any method to edit dc: meta in epub and the designated series under series shows up in Calibre?

Thanks and trying my best to explain the concept. If this is to vague please provide guide to explain more specific.

Credit goes to reddit user PrettyMuchPhysics

Convert the book to its existing format in Calibre. To do so, right-click it, select convert, convert individually. Make sure that on the top left and top right, both formats are the same (e.g. EPUB).

1. Then on the left select "Look and Feel".
2. On the top row, select "Styling",
3. Put a checkmark at the bottom right option where it says "Color".
4. Press OK.
5. After the book finished converting, right-click it and send it to the device, as usual.

This made the font an easy-to-read black, instead of a light-gray nightmare.

https://web.archive.org/web/20230608085927/https://old.reddit.com/r/kindle/comments/io79ru/solved_gray_font_in_a_book/