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unglue (v. t.) 1. To pay an author or publisher for publishing a Creative Commons ebook.
unglue (v. t.) 2. To make a digital book free to read and use, worldwide.
unglue (v. t.) 3. To make it legal for a digital book to be used, distributed, archived and preserved by libraries.
unglue (v. t.) 4. To reward authors and publishers for sharing books with the world.
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Find over 250,000 free ebooks here.

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Creators make ebooks in EPUB, MOBI, and PDF.
Ungluers love them for doing it.
GIVE
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Creators apply Creative Commons licenses to ebooks.
Ungluers read them at home, at a library, anywhere.
ASK
Creators ask downloaders to contribute what they choose.
Ungluers say thank you with their support.
"Thanks for Ungluing"

API Help

Ebook Widgets

You don't need an API key to embed Ebook (HTML) widgets.

Here's a widget that displays Unglue.it's featured ebook - it changes most every day! https://unglue.it/api/widget/featured/. Copy/paste this into your site:
If your website doesn't allow javascript (wordpress blogs, for example) you can use the no-script version. Copy/paste this into your site:
featured book cover
Today's Free Ebook at Unglue.it
Here's a sample widget for the book Riverwatch with ISBN 9780743480406: https://unglue.it/api/widget/9780743480406/. Copy/paste this into your site:

OPDS Catalog Feeds

We have a basic implementation of OPDS feeds. You don't need a key to use them. The starting point is https://unglue.it/api/opds/. Use the page parameter to page through the results.

Examples:

filtered by format
https://unglue.it/api/opds/epub/
filtered by license
https://unglue.it/api/opds/by-sa/
filtered by title search
https://unglue.it/api/opds/s.open/
filtered by keyword
https://unglue.it/api/opds/kw.fiction/
filtered by ungluer
https://unglue.it/api/opds/@eric/
filtered by having a Project Gutenberg or DOAB identifier (doab, gtbg)
https://unglue.it/api/opds/doab/-gtbg/?page=1

There's also an OPDS record available for every work on unglue.it. For example, requesting, https://unglue.it/api/opds/all/?work=13950 get you to the web page or opds record for A Christmas Carol.

ONIX Catalog Feeds

There is an ONIX 3.0 feed corresponding to every facet of our free ebook lists. You don't need a key to use them. There is a maximum of 100 books per result you can change with the max parameter. For example, here are the first twenty CC BY-ND-ND licensed books available in EPUB. Pages of 30 records each are available via the page parameter. Here's the first page of books from the Directory of Open Access Books.

There's also an ONIX record available for every free ebook on unglue.it. For example, here is Issues in Open Research Data.

Identifiers with Content type negotiation

There's a URI to identify every work used in OPDS feeds. HTTP content negotiation is used for these ids, so requesting application/atom+xml;profile=opds-catalog;kind=acquisition for https://unglue.it/api/id/work/13950/ get you to the web page or opds record for A Christmas Carol. requesting text/xml gets you the onix record. Otherwise, you get the normal html page.