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calibre

The one stop solution to all your e-book needs

Kovid Goyal

com.calibre_ebook.calibre
View on Flathub ↗

calibre is the one stop solution to all your e-book needs.

You can use calibre to catalog your books, fetch metadata for them automatically, convert them from and to all the various e-book formats, send them to your e-book reader devices, read the books on your computer, edit the books in a dedicated e-book editor and even make them available over the network with the built-in Content server. You can also download news and periodicals in e-book format from over a thousand different news and magazine websites.

Screenshots

calibre screenshot
calibre screenshot
calibre screenshot

Observed history

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Upstream releases

Release notes supplied by the developer. These dates are not Flathub package publication times.

9.14.028 Aug 2026

New features:

  1. Allow generating book covers using AI with different cover styles such as romance, sci-fi, pulp fiction etc. (To use it select a book and click Edit metadata and then the "AI Generate" button. Note that you will have to configure an image generating AI provider the first time you use this feature.)
  2. Edit book: File browser: When hovering the mouse over an image file show a floating preview of the image next to the file browser
  3. Tags editor: have searching ignore accents (Closes tickets: 2164853)
  4. AI: Add Anthropic and Grok backends for Claude and Grok models
  5. AI: Remove GitHub backend as service has been discontinued (Closes tickets: 2163567)
  6. Edit metadata dialog: Always scale up cover preview to fill available space while maintaining aspect ratio

Bug fixes:

  1. Content server: OPDS: Fix a regression that caused first line of comments to be missing (Closes tickets: 2165075)
  2. Undo delete books: Show a progress bar when more than five books have to be undeleted (Closes tickets: 2164811)
  3. Linux: Binary builds: Fix hyperlinks in labels not working on some Linux systems (Closes tickets: 2164584)
  4. Get books: Fix a regression that broke show in store (Closes tickets: 2164586)
  5. Fix cover images with empty EXIF records not showing on Kindle lockscreen (Closes tickets: 1943495)
  6. Fix a regression in 9.11 that broke configuring the Folder device driver (Closes tickets: 2163674)
  7. Google AI: Fix the checkbox to allow search grounding invisible in the config dialog (Closes tickets: 2163025)
  8. Fix a regression in 9.11 that broke reading metadata from HTML files in builds of calibre with Python runtime assertions enabled
  9. Edit book: Jump to class: Fix @charset rule causing jump to class to be off-by-one because it uses tiny css which ignores chaset rules while cssutils does not
  10. FB2 Input: Only accept known FB2 namespaces to avoid arbitrary file write
  11. Content server: Fix various arbitrary file write bugs for authenticated users
  12. Content server: Fix remote code execution for authenticated users
  13. Content server: Fix cross site scripting in legacy book details page
  14. MOBI Output: Make palmdoc compression robust against crafted input

New news sources:

  1. The Golfer's Journal by Ben Ng

Improved news sources:

  1. Pagina12
  2. The Week
  3. Nautilus
  4. Smithsonian Magazine
  5. FAZ.net
  6. Daily Mail
9.13.07 Aug 2026

New features:

    Bug fixes:

    1. PDF Output: Fix a regression in calibre 9 which caused links in PDF to scroll to a target location minus the top margin, thus ending up a few lines above the target
    2. Content server: Fix an error when uploading a data file to a book with no existing data files (Closes tickets: 2162628)
    3. Content server: Fix a regression in the previous release that broke searching in the builtin viewer (Closes tickets: 2162644)
    4. Content server: Fix a regression in the previous release that caused the conversion options sections to be missing (Closes tickets: 2162647)
    5. Book details panel: Fix a regression in the previous release that broke drag and drop of covers (Closes tickets: 2162711)
    6. Windows: Fix a crash caused by some third party plugins trying to send notifications in non-GUI threads (Closes tickets: 2162935)
    7. Bulk metadata dialog: Fix a regression in the previous release that caused the yes/no buttons to be hidden for Yes/No column edit controls (Closes tickets: 2162638)
    8. Edit book: Compress Images: Fix error when converting GIF to JPEG on Windows
    9. Linux: Preload html5-parser to avoid errors on systems that ship ancient libxml2 when converting to PDF

    New news sources:

      Improved news sources:

      1. Nautilus Magazine
9.12.031 Jul 2026

New features:

  1. macOS: Add sharing of books via AirDrop to the Connect/Share button
  2. Content server: Add support for plugins that can add new endpoints to the server backend
  3. Edit book: Compress images: Add an option to convert GIF images to JPEG/WebP
  4. ToC Editor: Add a button to sort the entries in the Table of Contents (Closes tickets: 2161171)
  5. Content server: OPDS: Add kind metadata to feed links (Closes tickets: 2161117)
  6. Kobo driver: Add support for latest Tolino firmware

Bug fixes:

  1. E-book viewer: Fix an issue causing text area width to change when using section titles in header/footers and the text is too long to fit in the space (Closes tickets: 2160341)
  2. When adding books via calibre.exe fix --with-library not working. Now calibre will switch to the specified library and only then add the book (Closes tickets: 2162073)
  3. When evaluating recursive templates inherit python template policy
  4. Fix inability to input more than ~30K characters in custom tag like columns (Closes tickets: 2161833)
  5. Fix some menu separators not rendering on some systems with high res monitors
  6. Content server: fix un-styled flash when transitioning between series/author views in dark mode
  7. Content server: Prevent unauthenticated users from updating annotations
  8. Edit metadata dialog: Fix right click menu->Remove format not working (Closes tickets: 2160467)
  9. Edit book: fix typo in string format that broke convert PNG to JPEG function
  10. Linux binaries: Preload libxml2 to ensure the correct version is loaded despite Qt WebEngine probing

New news sources:

    Improved news sources:

    1. Minerva
    2. Project Syndicate
    3. The Past
    4. Ancient Egypt
    5. New Scientist
    6. Substack
9.11.02 Jul 2026

New features:

  1. Allow exporting annotations in the HTML format as a standalone web page that can be viewed in any browser with support for light/dark themes, searching and filtering by highlight style
  2. E-book viewer: Ask AI: Allow using the {selected} placeholder when typing free form queries to the AI as well

Bug fixes:

  1. E-book viewer: Fix text area not always resizing correctly when window is resized when the scrollbar is enabled
  2. Fix a regression in the previous release that broke python templates in the book details panel
  3. Fix a regression in the previous release that caused default values for custom columns to not be used when adding new books

New news sources:

    Improved news sources:

    1. Scientific American
    2. Phoronix