r/Calibre

Is there an updated guide on how to remove kfx-zip? I've tried going offline on kindle to download but it pops up saying a connection is required.
To my knowledge, amazon often updates drm often? So unsure if there was a more updated guide than the one I've been following

Just to notify the new version of BookSeerr (v2) is out.
It's a total new version built from scratch with the following remarkable features:

• New modern, sleek and mobile-friendly UI based on TailwindCSS
• Rewritten from scratch using OpenSpec as framework for a modern Spec-driven Development process
• Kubernetes support
• Reduced hallucinations using metadata for LLM suggestions
• Semantic similarity based on synopsis for a fast recommendation of books already in library

Still available in my GitLab, still released under GPLv3 and later

Screenshots in the announce blog post (Italian only, sorry)

Hello ! I'm the maintainer of Calibre Web NextGen .. ask me anything or request a feature I'm listening!

experience -> coding for 15+ years, primarily iOS and Py, but largely full stack. I have a serious passion for it. Now I work with a company that has a high focus on AI tooling, and have been experimenting with reliable and scalable flows.

goal -> bringing Calibre Web Automated and Calibre Web to a fully maintained status, including rapidly adding fully tested community features**.**

you -> help out by testing and posting issues. There are a ton of preexisting issues that get exposed when I fix others.

Please feel free to ask me anything and contribute ! and tell me if you have any issues or suggestions but pls file it on git so it gets done https://github.com/new-usemame/Calibre-Web-NextGen

I'm importing MOBI files of a manga series and every page past the Cover page is blank.
Is there a way to fix this?

I'm trying to install the DeDRM plugin on my Mac (Mac OS 26.5) with Calibre version 9.8.0.

I've downloaded the zipped DeDRM master folder from github and unzipped it. Inside are the DeDRM and Obok plugins, but they are not zipped. I've tried compressing them into a zip and then adding them to Calibre, but I get the following error message

calibre, version 9.8.0
 ERROR: Unhandled exception: <b>InvalidPlugin</b>:The plugin in '/Users/leadstripes/Desktop/DeDRM_tools-master/DeDRM_plugin.zip' is invalid. It does not contain a top-level __init__.py file

calibre 9.8  embedded-python: True
macOS-26.5-arm64-arm-64bit-Mach-O Darwin ('64bit', 'Mach-O')
('Darwin', '25.5.0', 'Darwin Kernel Version 25.5.0: Mon Apr 27 20:41:19 PDT 2026; root:xnu-      12377.121.6~2/RELEASE_ARM64_T8122')
Python 3.14.4
OSX: ('26.5', ('', '', ''), 'arm64')
Interface language: None
EXE path: /Applications/calibre.app/Contents/MacOS/calibre
Traceback (most recent call last):
  File "calibre/gui2/preferences/plugins.py", line 331, in add_plugin
  File "calibre/customize/ui.py", line 574, in add_plugin
  File "calibre/customize/ui.py", line 88, in load_plugin
  File "calibre/customize/zipplugin.py", line 311, in load
  File "calibre/customize/zipplugin.py", line 401, in _locate_code
calibre.customize.InvalidPlugin: The plugin in '/Users/leadstripes/Desktop/DeDRM_tools-master/DeDRM_plugin.zip' is invalid. It does not contain a top-level __init__.py file

Kobo Libra Colour

When reading books, it says on the top of the screen “0 minutes remaining in chapter” and it will not refresh. Is there a setting, script or addon available to show the estimated time remaining in chapter, or do I just have to live with it?

(Not that it’s a big deal- just a “would be nice” thing to know for future reference)

Kobo announced today that as of June there will be direct integration between its devices and The Storygraph. It does state that this will be 'account based content' potentially implying that sideloaded content might not work. As far as I know there is no public API either, so my question is, is it likely that content loaded via Calibre could be enabled somehow?

Hi, there are some books that i already transfered from calibre to my kobo clara bw but without putting the series name.

How do i edit the series info so that it appears on the "series" tab on my ereader ?

I want to sync my calibre Library to BookFusion using the BookFusion Plugin. The library holds 5,000 ebooks. I seem to have reached a block with 2,400 having been successfully synced. The plug keeps stopping at this number of synced books despite deleting the 2,401th book a number of times (a different book each time)

IS THEIR A BOOKFUSION LIMIT THAT IS BLOCKING?

Hi everyone,

I’m a huge fan of Calibre and the incredible work Kovid Goyal and the community have done over the years. It’s an absolute powerhouse. However, as someone deeply invested in self-hosting, I keep coming back to one burning question: Will we ever get a true, fully-featured server version of Calibre?

I know we have the built-in Content Server, but I'm talking about moving the entire core architecture to a server-first model. Imagine a headless Calibre running on your NAS/server, managed entirely via a modern Web GUI (or a lightweight native desktop client connecting to the server).

Here is why a native server version would be an absolute game-changer for self-hosting enthusiasts (and could even introduce passionate readers to the world of self-hosting!):

1. Massive Storage Savings on PC: No need to keep gigabytes of eBooks on your personal laptop.
2. True Centralization: A single, unified library for the whole household and all your devices. Add a book from your laptop, edit metadata from your phone, read on your eReader.
3. Deep eReader Integration: This is the holy grail. I currently use a custom-built, self-hosted service I made to act as a bridge between my library and my KOReader device. It completely transformed my reading experience. Imagine if Calibre natively allowed you to:
   • Automatically queue and send books to your device the moment it connects to Wi-Fi.
   • Sync, aggregate, and analyze reading highlights and statistics (reading time, sessions, heatmaps).
   • Automatically backup device-specific files directly to your server.
   • Export all this reading data easily to tools like Obsidian through appropriate plugins that also connect directly to the server.

I am aware that projects like Calibre-Web and Calibre-Web Automated exist. And while they have certainly done a great job, here is the catch: they don't maintain the raw power of Calibre. If you switch to them, you lose access to the advanced TOC editor (just to name one of many fantastic features), the advanced query system, custom columns management, and the ability to install any compatible plugin.

I simply don't want to give up Calibre's power just to get a web interface. That's why those alternatives, while cool, don't make sense for my workflow right now. I want the real deal, with the official architecture and Kovid Goyal's blessing.

Am I the only one who feels the desperate need for a service like this? Would a modern, server-first rewrite (or expansion) of Calibre be something the community would support?

Would love to hear your thoughts!

I download EPUBs, convert them to KFX format, and transfer them to my Kindle. Some of these EPUBs show the cover correctly in Calibre, but after transferring to the Kindle, the cover disappears on the device even though it still shows in Calibre.

I also tried downloading different cover images from the internet and updating them manually, but I’m getting the same result.

Can anyone guide me through this? Is the issue with the EPUB file itself, or am I missing something during the conversion/transfer process?

Planned to resell and had it degistered and stored. Battery seems to be good. Do i need to do anything to it by Wednesday 20th if i want to begin side loading?? Want to use calibre or usb.

Hey folks - just looking for confirmation here - my oasis won't let me pull a book off and convert books on my mac. Anyone else having the issue, or am I bungling something? I just picked up an xteink4, and was hoping to read my DCC books on it. Unfortunately, they can only be bought on Amazon, otherwise I would just rebuy them somewhere else.

Note: I would also accept someone else telling me where I can buy the DCC books in a DRM free store.

I moved books off my old Kindle to my laptop and how do I convert these running Caliber on a laptop running Linux Mint and I am trying to convert these so I can put them on Pocketbook Verse

Me disseram um tempo atrás que a Amazon atualizou o Kindle e não seria mais possível transferir arquivos de livros via USB. Desde então, há meses, não liguei mais o Wi-Fi no meu Kindle, nem mesmo assinei o Kindle Unlimited (algo que eu gostava), pra não perder essa funcionalidade, pois tem muitos livros que "converto" para uma linguagem mais fácil usando um agente de IA que construí (livros bem antigos difíceis de ler) e transfiro via Calibre para o dispositivo.

Porém, lendo algumas notícias mais recentes, notei que talvez essa perda de funcionalidade seria APENAS para a função de baixar e transferir livros adquiridos na própria Amazon.

Então fiquei confuso. A ação que já faço (baixar livros epub / mobi que não têm na Amazon para comprar) ou livros que eu mesmo adapto - continuarei podendo transferir via usb no calibre, mesmo com essa nova atualização?

Se alguém puder me ajudar, agradeço!

I'ts my first time using calibre, i usually buy physical books but i wanted to read this one and It is too expensive on paper, so my dad recommended calibre to me.

The problem i have is that my Kindle does not appear in the menu to put It in, It is in the right format and everything, but i think my laptop does not recognize my kindle. The cable i use works for charging the device, so i don't know what to do. My Kindle is also really old, but i don't think thats a problem.

I'm not really sure but i think it's a problem with the cable.

Does anyone have any solutions for this problem?? I'm not really familiar with this program so i have no idea how to fix this.

And if the problem is with the cable, could you recommend one to buy that might work?

Sorry if the explanation is not really clear, english is not my first language

Thanks in advance!!

Update!!: it is not working for Georgian books, for English books it works... it's annooooooyyying!!!!

Hi, it's been already around a week, when I press download metadata it sends this error all the time:

It doesn't matter what book it is, I mostly search for Georgian books, but has same error for English ones too.

When searching same book on goodreads, it searches normally.

https://preview.redd.it/mlpenmrwqy1h1.png?width=614&format=png&auto=webp&s=a8b7b8e9c99b1c12a01c60f477a2e9d3aaa04dbb