epub-specs
Repository for EPUB 3 Revisions
As of August 14, 2020, the EPUB 3 Working Group became the maintainer of the EPUB 3 specifications. In June 2023, after the publication of the EPUB 3.3 Recommendation, the Working Group was rechartered under the name of Publishing Maintenance Working Group, and has been maintaining the specifications ever since.
Current development: EPUB 3.4
The EPUB 3.4 revision started on February 11, 2025. It is chartered to run until February 5, 2027.
Editor’s Drafts of documents under active development:
- EPUB 3 Overview (Working Group Note)
- EPUB 3.4 (On Recommendation track)
- EPUB Reading Systems 3.4 (On Recommendation track)
- EPUB Accessibility 1.2 (On Recommendation track)
- EPUB Accessibility Techniques 1.2 (Working Group Note)
- EPUB Annotations 1.0 (On Recommendation track)
- EPUB Annotations Vocabulary 1.0 (Working Group Note)
For more information about the meeting schedule, how to join or participate, etc., please consult the Publishing Maintenance Working Group’s home page, or contribute to this repository via issues and comments.
Latest version of the EPUB Recommendation: EPUB 3.3
On the 25th of May, 2023, the EPUB 3 Working Group published the following EPUB 3.3 Recommendations:
For a complete list of publications by that Working Group, including all related Working Group Notes, see the separate index page.
The Working Group maintains an errata file for all the specifications and notes. If you want to report a new erratum, please follow the guidelines in that file.
Some issues have been left open by the Working Groups as deferred issues. Issues for specifications not actively maintained have been marked as abandoned and closed. These issues may be resurrected in the future if work is resumed on their respective specifications.
Repository Structure
The contents of each folder are as follows:
archive– Specifications that are no longer in active development either because the revision has finished or work has been abandoned.epub33– The specifications revised as part of the 3.3 revision.epub34– The specifications being revised as part of the 3.4 revision.
Contributing to the Repository
Use the standard fork, branch, and pull request workflow to propose changes to the specification. Please make branch names informative—by including the issue or bug number for example.
Editorial changes that improve the readability of the spec or correct spelling or grammatical mistakes are welcome.
Please read CONTRIBUTING.md, about licensing contributions.
Historical Records
See the following for access to meeting minutes, sub-group work, discussions, etc. for past revisions:
- EPUB 3.0 - Available as a set of markdown files in the archive directory of this repository.
- EPUB 3.0.1 - Available as document files from Google Drive.
- EPUB 3.1 - Available as document files from Google Drive.
- EPUB 3.2 - Available from the EPUB 3 Community Group wiki.
Refer to the EPUB 3 Working Group’s home page for information about the current revision.
Code of Conduct
W3C functions under a code of conduct.
For any further help, contact Ivan Herman, Wendy Reid, Shinya Takami, or Matt Garrish.