This repository aims to develop a static snapshot of Calibre, forked from the state of upstream as of 5 December 2025, with all AI antifeatures removed, and with a stable, reproducible build. Hopefully, this can serve as a starting point for any future hard forks of Calibre, or for any efforts to produce packages without pulling from upstream.

Any issues and pull requests related to new feature work, security fixes, or any other development outside of that immediate goal will be closed and/or rejected.

No promises or guarantees of progress are made or implied — the above is aspirational and as time is available.

Thanks to @mkj@social.mkj.earth for the suggestion.

Stable and Reproducible Build Goals

An eventual successful build process for this project will:

• Not depend on any third-party services other than static code repositories (e.g.: Debian package repositories, or Git reposit specified by commit hashes).
• Be buildable locally, outside of CI environments.
• Have all implicit dependencies specified, perhaps through Nix or Docker.
• Be based on current Python packaging standards as much as possible (the existing pyproject.toml helps a lot here).

An eventual succesful build process for this project may or may not:

• Produce build artifacts for specific Linux variants (e.g.: Arch or Debian packages).
• Produce distro-neutral build artifacts (e.g.: Flatpak).
• Rename build artifacts to be clearly distinguishable from upstream packages.

An eventual succesful build process for this project might not:

• Produce artifacts for macOS or Windows, purely due to the difficulty of procuring test environments for those scenarios.
• Be usable as-is by end-users. This is intended to be focused on developers and maintainers looking to fork or repackage Calibre upstream.
• Be done at any specific time, in any specific year, or in any specific decade.

An eventual succesful build process for this project will not:

• Add even a single new feature. Seriously.
• Meet any specific level of security; this is good work to be done in a hard fork using this archive as a starting point.

calibre

calibre is an e-book manager. It can view, convert, edit and catalog e-books in all of the major e-book formats. It can also talk to e-book reader devices. It can go out to the internet and fetch metadata for your books. It can download newspapers and convert them into e-books for convenient reading. It is cross platform, running on Linux, Windows and macOS.

For more information, see the calibre About page.

Screenshots

Screenshots page

Usage

See the User Manual.

Development

Setting up a development environment for calibre.

A tarball of the source code for the current calibre release.

Bugs

Bug reports and feature requests should be made in the calibre bug tracker at Launchpad. GitHub is only used for code hosting and pull requests.

Support calibre

calibre is a result of the efforts of many volunteers from all over the world. If you find it useful, please consider contributing to support its development. Donate to support calibre development.

Building calibre binaries

See Build instructions for instructions on how to build the calibre binaries and installers for all the platforms calibre supports.

calibre package versions in various repositories