27 May 2021

EPUB® is the distribution and interchange format standard for digital publications and documents based on Web Standards. EPUB defines a means of representing, packaging and encoding structured and semantically enhanced Web content – including XHTML, CSS, SVG, images, and other resources – for distribution in a single-file format.

The current version of EPUB is EPUB 3.2

For more information about this version, see the description below.


Name Mission Membership Requirements Links Chairs/Staff Contact
EPUB 3 Working Group “…maintain and develop the EPUB 3 family of specifications, to represent the EPUB community in the W3C, and to support EPUB 3 content creators and consumers by further advancing, refining, and clarifying the current EPUB 3 specification.” W3C member Home page
Wendy Reid, Dave Cramer, Shinya Takami
Publishing Business Group “…to foster ongoing participation by members of the publishing industry and overall ecosystem in the development of the Web for publishing, and to serve as a conduit for feedback between the publishing ecosystem and W3C.” W3C member, W3C Business Group Member Home page
Cristina Mussinelli, Liisa McCloy-Kelley, Daihei Shiohama
Audiobooks Working Group “The mission of the Audiobooks Working Group is to maintain the Publication Manifest and Audiobooks Recommendations and related Working Group Notes.” W3C member Home Page
Tzviya Siegman, Garth Conboy, Wendy Reid
Publishing Community Group “Incubation zone for Publishing@W3C. Bring your experiments here.” anyone can participate GitHub
Mateus Teixeira, Jeff Xu

Current Activity

Under Development

Name Status Next Milestone Contact
EPUB 3.3 Core W3C Working Draft Candidate Recommendation EPUB 3 Working Group
EPUB 3.3 Reading Systems W3C Working Draft Candidate Recommendation EPUB 3 Working Group
EPUB Accessibility 1.1 W3C Working Draft Candidate Recommendation EPUB 3 Working Group


No announcements at this time.

All Specifications

EPUB 3.2

EPUB 3.2 is a minor revision of the EPUB 3 specification, which can be considered as a successor to both EPUB 3.0.1 and EPUB 3.1. EPUB 3.1 did not receive wide adoption, and the Community Group decided to create EPUB 3.2 to be strongly backward-compatible with EPUB 3.0.1, while retaining many of the changes made in EPUB 3.1 (A given version of EPUB is said to be strongly backwards-compatible with an older version if and only if any EPUB publication conformant to the older version is also conformant to the newer version). All valid EPUB 3.0.1 files should also be valid EPUB 3.2 files.

Core Specifications

Core Modules





EPUB 3.1

EPUB 3.1 is the first major revision of EPUB 3. The key areas of focus for this revision were: simplification of the specifications (both structure and features), alignment with the Open Web Platform, and clarification of scripting contexts.

Core Specifications

Core Modules





EPUB 3.0.1

EPUB 3.0.1 is a minor maintenance update to EPUB 3.0. On June 26, 2014 the IDPF announced that the IDPF membership had overwhelmingly approved elevation of EPUB 3.0.1 to final Recommended Specification status.

As of as of January, 2017, EPUB 3.0.1 has been superseded by EPUB 3.1, which is now the current version of the EPUB standard.

Core Specifications

EPUB 3.0

EPUB 3 was developed pursuant to a charter approved by the IDPF Membership in May, 2010. EPUB 3.0 was approved by the IDPF membership as a final Recommended Specification effective October 11, 2011, and superseded the previous release, EPUB 2.0.1.

As of as of June, 2014, EPUB 3.0 has been superseded by EPUB 3.0.1, which is now the current version of the EPUB standard.

Core Specifications

Core Modules


In collaboration with O'Reilly, guides to best practices for creating EPUB content.

EPUB 2.0.1

  • Specification:
    See below
  • Status:
    Recommended Specification
  • Date Published:
  • Charter:
  • Superseded by:
    EPUB 3.0

EPUB 2.0.1 is a maintenance release of EPUB 2. Its development was chartered in 2009, and the final standard was approved by the IDPF Membership as a Recommended Specification in May, 2010.

EPUB 2.0.1 was superseded by EPUB 3.0 in October, 2011. As of June 2014, the latest released version of EPUB is EPUB 3.0.1. EPUB 2.x is now considered obsolete and is no longer under active maintenance.

Core Specifications

EPUB Accessibility

Addresses discovery and production requirements for accessible EPUB Publications.

Adaptive Layout

CSS Page Templates - allowing content to be formatted into a sequence of richly-designed reflowable pages.

Dictionaries and Glossaries

Defines a content model for the representation of dictionaries and glossaries in EPUB documents.

Distributable Objects

Defines a method for the encapsulation, transportation, and integration of Distributable Objects in EPUB Publications.

Fixed Layouts

Interoperable metadata expressions for fixed-layout EPUB documents.

EPUB for Education

Profile of EPUB 3 to standardize educational publishing.


Defines a content model for the representation of indexes in EPUB documents.

Multiple Renditions

Defines attributes and metadata for the inclusion of more than one Rendition of an EPUB Publication in the ZIP container, as well as a mechanism for mapping locations between Renditions.

Open Annotation

Defines how to apply Open Annotations in the context of EPUB, thereby enabling users and service providers to utilize a non-proprietary representation of annotation data.


Defines two models for preview content: as a standalone preview EPUB Publication and as a collection embedded within the parent EPUB Publication.

Region-Based Navigation

Defines a method for defining visual regions of interest on fixed-layout pages and a new default navigation model for Reading Systems to navigate between them.

Scriptable Components

Packaging and integration of widgets in EPUB, and an API for communication between dynamic scripted components.

Canonical Fragment Identifiers

EPUB Canonical Fragment Identifiers (CFI) defines a standardized method for referencing arbitrary content within an EPUB® Publication through the use of fragment identifiers.