EPUB Parser

build epub parser coverage


gem install epub-parser


As a library

require 'epub/parser'

book = EPUB::Parser.parse('book.epub')
book..titles # => Array of EPUB::Publication::Package::Metadata::Title. Main title, subtitle, etc...
book..title # => Title string including all titles
book..creators # => Creators(authors)
book.each_page_on_spine do |page|
  page.media_type # => "application/xhtml+xml"
  page.entry_name # => "OPS/nav.xhtml" entry name in EPUB package(zip archive)
  page.read # => raw content document
  page.content_document.nokogiri # => Nokogiri::XML::Document. The same to Nokogiri.XML(page.read)
  # do something more
  #    :
book.cover_image # => EPUB::Publication::Package::Manifest::Item which represents cover image file

See document’s Home or API Documentation for more info.

epubinfo command-line tool

epubinfo tool extracts and shows the metadata of specified EPUB book.

$ epubinfo ~/Documebts/Books/build_awesome_command_line_applications_in_ruby.epub
Title:              Build Awesome Command-Line Applications in Ruby (for KITAITI MAKOTO)
Identifiers:        978-1-934356-91-3
Titles:             Build Awesome Command-Line Applications in Ruby (for KITAITI MAKOTO)
Languages:          en
Creators:           David Bryant Copeland
Publishers:         The Pragmatic Bookshelf, LLC (338304)
Rights:             Copyright © 2012 Pragmatic Programmers, LLC
Subjects:           Pragmatic Bookshelf
Unique identifier:  978-1-934356-91-3
Epub version:       2.0

See Epubinfo for more info.

epub-open command-line tool

epub-open tool provides interactive shell(IRB) which helps you research about EPUB book.

epub-open path/to/book.epub

IRB starts. self becomes the EPUB book and can access to methods of EPUB.

=> "Title of the book"
=> [Author 1, Author2, ...]
=> #<Set: {"nav"}> # You know that first resource of this book is nav document
nav = resources.first
=> ...
=> #<Addressable::URI:0x15ce350 URI:nav.xhtml>
=> "application/xhtml+xml"
puts nav.read
<?xml version="1.0"?>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:epub="http://www.idpf.org/2007/ops">
=> nil
exit # Enter "exit" when exit the session

See EpubOpen for more info.

epub-cover command-line tool

epub-cover tool extract cover image from EPUB book.

% epub-cover childrens-literature.epub
Cover image output to cover.png

See EpubCover for details.


Documentation is available in homepage.

If you installed EPUB Parser by gem command, you can also generate documentaiton yourself(rubygems-yardoc gem is needed):

$ gem install epub-parser
$ gem yardoc epub-parser
Files:          33
Modules:        20 (   20 undocumented)
Classes:        45 (   44 undocumented)
Constants:      31 (   31 undocumented)
Methods:       292 (   88 undocumented)
52.84% documented
YARD documentation is generated to:

It will show you path to generated documentation(/path/to/gempath/ruby/2.2.0/doc/epub-parser-0.2.0/yardoc here) at the end.

Or, generating by yardoc command is possible, too:

$ git clone https://gitlab.com/KitaitiMakoto/epub-parser.git
$ cd epub-parser
$ bundle install --path=deps
$ bundle exec rake doc:yard
Files:          33
Modules:        20 (   20 undocumented)
Classes:        45 (   44 undocumented)
Constants:      31 (   31 undocumented)
Methods:       292 (   88 undocumented)
52.84% documented

Then documentation will be available in doc directory.


  • Ruby 2.3.0 or later


  • gepub - a generic EPUB library for Ruby

  • epubinfo - Extracts metadata information from EPUB files. Supports EPUB2 and EPUB3 formats.

  • ReVIEW - ReVIEW is a easy-to-use digital publishing system for books and ebooks.

  • epzip - epzip is EPUB packing tool. It’s just only doing 'zip.' :)

  • eeepub - EeePub is a Ruby ePub generator

  • epub-maker - This library supports making and editing EPUB books based on this EPUB Parser library

  • epub-cfi - EPUB CFI library extracted this EPUB Parser library.

If you find other gems, please tell me or request a pull request.



  • [BUG FIX]Make epub:type a Set



  • [REFACTORING]Add EPUB::Parser::NokogiriAttributeWithPrefix and use Nokogiri::XML::Node#attribute_with_prefix instead of EPUB::Parser::Utils#extract_attribute

  • Set default value for detect_encoding argument for EPUB::Publication::Package::Manifest::Item#read to false

  • Make XML library switchable between REXML and Nokogiri

  • Make REXML a default XML backend

See CHANGELOG for older changelogs and details.


  • Consider to implement IRI feature instead of to use Addressable

  • EPUB 3.2

  • Help features for epub-open tool

  • Vocabulary Association Mechanisms

  • Implementing navigation document and so on

  • Media Overlays

  • Content Document

  • Digital Signature

  • Handle with encodings other than UTF-8


  • Simple inspect for epub-open tool

  • Using zip library instead of unzip command, which has security issue

  • Modify methods around fallback to see bindings element in the package

  • Content Document(only for Navigation Documents)

  • Fixed Layout

  • Vocabulary Association Mechanisms(only for itemref)

  • Archive library abstraction

  • Extracting and organizing common behavior from some classes to modules

  • Multiple rootfiles

  • Abstraction of XML parser(making it possible to use REXML, standard bundled XML library of Ruby)


This library is distribuetd under the term of the MIT License. See MIT-LICENSE file for more info.