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This is a tool to generate better EPUB ebooks from Fimfiction stories. It's also a Chrome/Firefox extension, replacing the default EPUB download option with this tool. If you're on an Arch Linux-based system you can install it from the Arch User Repository.

Screenshot of the web extension


  • The generated ebook is in modern EPUB3 format with fallbacks for older EPUB2 reading systems
  • Improved styling and formatting of content compared to Fimfiction's export options
  • Cover image can be changed from an image file or url
  • Downloads and embeds artwork from the story inside the EPUB file, including YouTube thumbnails, for optimal offline reading and archiving (optional)
  • Rating, tags, status, story description and more info are available on the title page
  • The table of contents page includes chapter modification dates and word counts
  • Option to put all author notes in an index at the end of the ebook
  • Option to not add a title heading for chapters (in case the story has its own)
  • Tweak paragraph style from double-spaced to indented (similar to book typesetting, may not look good on every story)
  • Emoji, icon and webp support (webp images gets converted to png)
  • Calculate the Flesch reading ease value of the story
  • Customize metadata of the generated ebook, such as title, author, subjects and description
  • Command line tool with same features as the web extension


You can have a look at what a generated EPUB looks like here. It was generated from the story Summer Island.

Usage (web extension)

You can download the Chome extension from Chrome Web Store and Firefox Add-ons

Installation & usage (command line)

You can install the tool by running npm install -g fimfic2epub. On Arch Linux-based systems you can install it from the AUR like this: yay -S fimfic2epub (replace yay with your favorite AUR-helper)

You can then run the tool it like this:

$ fimfic2epub <story id/url> [<optional filename>]

By default the EPUB will be saved in the current working directory with the filename Author - Title.epub. Run fimfic2epub -h to see a list of all flags.

  Usage: fimfic2epub [options] <story> [filename]

  Tool to generate improved EPUB ebooks from Fimfiction stories


    -V, --version                output the version number
    -d, --dir <path>             Directory to store ebook in. Is prepended to filename
    -t, --title <value>          Set the title of the story
    -a, --author <value>         Set the author of the story
    -T, --typogrify              Enable typographic fixes (smart quotes, dashes, ellipsis, ordinal)
    -c, --no-comments-link       Don't add link to online comments
    -H, --no-headings            Don't add headings to chapters (includes chapter title, duration and word count)
    -W, --no-chapter-word-count  Don't add word count to chapter headings
    -D, --no-chapter-duration    Don't add time to read to chapter headings
    -b, --no-bars                Don't add chapter bars to show reading progress
    -r, --no-reading-ease        Don't calculate Flesch reading ease
    -e, --no-external            Don't embed external resources, such as images (breaks EPUB spec)
    -n, --no-notes               Don't include author notes
    -i, --notes-index            Create an index with all author notes at the end of the ebook
    -p, --paragraphs <style>     Select a paragraph style <spaced|indented|indentedall|both> (default: spaced)
    -k, --kepubify               Add extra <span> elements for Kobo EPUB (KEPUB) format
    -j, --join-subjects          Join dc:subjects to a single value
    -w, --wpm <number>           Words per minute. Set to 0 to disable reading time estimations (default: 200)
    -C, --cover <url>            Set cover image url
    -h, --help                   output usage information


Download with automatic filename:
$ fimfic2epub 289663
$ fimfic2epub

Download and save to a specified dir/filename:
$ fimfic2epub 289663 path/to/file.epub
$ fimfic2epub --dir path/to/my/dir 289663 ebook_%id%.epub # %id% gets replaced by the story id


Make sure Node.js is installed. After you've cloned this repository, run npm install and npm run build to build it. This project uses gulp.


When developing the code, you can run npm run dev watch. This will rebuild the code quickly and lint it when you save. To just lint, run npm run dev lint and to clean, run npm run dev clean. To build for production, just run npm run build.

To test the Chrome extension, click Load Unpacked and pick the extension/ directory. To test the Firefox extension, go to Add-ons and Debug Add-ons. Then Load Temporary Add-on and pick the extension.xpi file. To reload them after a rebuild, click the Reload button in Chrome and/or Firefox.