kovidgoyal

    kovidgoyal/calibre

    The official source code repository for the calibre ebook manager

    26.3K stars
    2.7K forks
    26.3K GitHub watchers
    Updated Nov 1, 2026
    View on GitHub

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    Where it stands

    Rank, growth pace and release cadence relative to everything GStars tracks.

    5 releases in the last 90 days, the latest 9 days ago, with 374 contributors on GitHub.

    Use Cases & Benefits

    • Manages, views, converts, edits, and catalogs e-books across major formats while syncing with e-book reader devices.
    • Offers a comprehensive, cross-platform solution integrating metadata fetching, format conversion, and device communication in one tool.
    • Use for organizing and converting personal e-book collections into multiple formats for diverse reading devices.
    • Use for downloading and converting newspapers into e-book formats for convenient offline reading.
    • Use for developing or extending e-book management features using its Python-based open source codebase.

    Should you depend on it?

    License terms, project hygiene and risks, from GitHub metadata and GStars' snapshots.

    License

    GPL 3.0

    Copyleft: distributing software that includes it generally requires releasing your source under the same license.

    Community files

    • README: present

    Watch-outs

    • GPL-style copyleft: including it in distributed software generally requires releasing your source under the same license.

    General guidance from repository metadata, not legal advice. How we score

    From the README

    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.

    Excerpt from the kovidgoyal/calibre README on GitHub (GPL-3.0 license). © its authors.Read the full README on GitHub

    Daily snapshots

    Stars gained per day, and how forks and open issues moved, from GStars' daily snapshots

    Forks

    2.7K+101

    Open issues

    9+3

    Compared with peers in Backend

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