Calibre + OPDS

If you manage your eBooks collection with Calibre, this tool called calibre2opds will allow you to generate an OPDS compatible XML catalog (Stanza and Aldiko use this standard), complete with cross-references, and external links to interesting web pages about your books.

In addition, an HTML version of your catalog can also be generated, allowing access from any browser-based ebook reader (e.g. a netbook with Firefox and ePubReader)

Requires : Java 1.5 or higher, Calibre 0.6 or higher, and optionally a means of publishing the catalogs, e.g. a Dropbox account

What is OPDS?

The open ebook community and the Internet Archive are pleased to announce the release of the first production version of the Open Publishing Distribution System (OPDS) Catalog format for digital content.  OPDS Catalogs are an open standard designed to enable the discovery of digital content from any location, on any device, and for any application.

The specification is available at:

Based on the widely implemented Atom Syndication Format, OPDS Catalogs have been developed since 2009 by a group of ebook developers, publishers, librarians, and booksellers interested in providing a lightweight, simple, and easy to use format for  developing catalogs of digital books, magazines, and other content.

OPDS Catalogs are the first component of the Internet Archive’s BookServer Project, a framework supporting open standards for discovering, lending, and vending books and other digital content on the web.

Who Benefits?

Authors find wider distribution for their work.
Publishers both big and small can distribute books directly to readers.
Book sellers find new and larger audiences for their products.
Device makers can offer access to millions of books instantly.
Libraries can continue to loan books in the way that patrons expect.
Readers get universal access to all knowledge.


Brewster Kahle, digital librarian and founder of the Internet Archive, says, “As the audience for digital books grows, we can evolve from an environment of single devices connected to single sources, into a distributed system where readers can find books across the Web to read on whatever device they have.  OPDS Catalogs can help people find, buy, or borrow books, in the same way we use an open system to find Web sites, delivering the promise of a digital library to millions of readers around the world.”

OPDS Catalogs, which are easily produced from simple descriptive metadata, can be harvested by search engines and aggregated by online retailers; their design supports independent reading systems, bookstores, the development of portable bookshelves, and other applications facilitating the use of digital materials.

The Internet Archive makes available over 1 million public domain books in EPUB and PDF formats through OPDS Catalogs [opds].  IA’s titles are made available by Kobo Books, Amazon, and other distributors.


For publishers, OPDS Catalogs offers new possibilities for digital distribution and promotion.  “We’re excited to support the OPDS standard,” said Mark Coker, founder of Smashwords, a distributor of over 18,000 ebooks for 8,000 independent authors and publishers around the world.  “Our mission is to maximize the distribution opportunities for our authors.  By supporting OPDS Catalogs, we make it easy for multi-platform e-reading apps, devices and online bookstores to expose our catalog to millions of readers.”

Dave Thomas, co-founder of Pragmatic Programmers, a leading publisher of programming books, says: “The OPDS Catalogs specification is a major step forward in opening up the distribution of electronic media to a broader world—publishers and readers can interact directly via the web and via reading devices to ensure that the most up-to-date content is available in real time.”


OPDS Catalogs, derived from Lexcycle’s Stanza application, allow an attractive presentation of book catalogs on mobile devices.    Well-known ebook expert Liza Daly, developer of the mobile reading application, Ibis Reader, says, “We’ve been impressed by how quickly OPDS Catalogs allow us to offer a collection of thousands of free and public domain books.  Now that users have access to a wide range of different reading systems, it’s critical that the industry move toward broad distribution networks that mirror the web.”

The leading independent reading application for the Android operation system, Aldiko, also uses OPDS Catalogs.  Aldiko co-founder Tiffany Wong says: “The OPDS standard is a major step towards a truly open ecosystem for ebook distribution, providing the much needed glue between readers and a growing number of independent ebook sources. OPDS enables content providers to reach more readers and enables readers to discover more and more content. Thanks to the adoption of OPDS, Aldiko users are not limited to content from a single ebookstore. Instead, they can access thousands of free and commercial content from different ebook catalogs right within a single application. Currently, Aldiko users are downloading over 1.2 million books every month through OPDS catalogs.”


For libraries of all sizes, OPDS Catalogs can permit library patrons to access digital books and other materials without having to visit a library website.  In a special report [pdf] released in July 2010 on ebooks for public libraries, the Council of State Library Agencies (COSLA) endorsed the exploration of OPDS Catalogs.  The leader of the COSLA task force, Oregon State Librarian Jim Scheppke, writes: “State librarians across the country have been looking for ways to improve how library users discover and use library resources, especially e-books. In Oregon, and in other states I’m sure, we look forward to evaluating the potential of OPDS Catalogs as a basis for these improvements.”

OPDS Catalogs can be used to make data from one site available to others.  “There is clear demand for enhancing library catalogs around the world with information about ebooks,” says George Oates, the project lead for Open Library.  “We’re looking forward to using OPDS Catalogs to help libraries supplement their own catalogs with ebook records.”

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