Ex Libris Lookup

The essential companion for book lovers, librarians & researchers. Instantly find any book's Dewey, ISBN & LCCN, then cite it in MLA, APA, Chicago or BibTeX.

Ex Libris Lookup — Every book, by the numbers.

Ex Libris Lookup is a fast, private reference tool for readers, students, and librarians. Find the identifiers and details behind any book, build a personal library, and track your reading — all without accounts, ads, or tracking.

Find any book Search by title, author, keyword, or ISBN and instantly pull the details you need. Or scan a book's ISBN barcode with your camera to search without typing a single character.

Library identifiers at your fingertips Look up Dewey Decimal (DDC), ISBN, LCCN, ISSN, and ASIN numbers for cataloging, citations, and reference. Tap to copy any identifier in a moment.

Your own library, on your device Save books to a personal library that lives entirely on your device — no cloud, no sign-in. Organize titles onto shelves, add books in bulk, and keep everything at hand offline.

Smart entry Adding books by hand is effortless. As you type, Ex Libris Lookup suggests authors and series drawn from your own saved library, so your catalog stays consistent and quick to build.

Track your reading Mark books as want-to-read, reading, read, or did-not-finish. Record your current page to watch your progress, rate finished titles, and save memorable quotes and notes.

Smart tags & summaries On-device text analysis suggests relevant tags and concise summaries for your books — processed right on your phone, never sent anywhere.

For You recommendations Discover what to read next with personalized suggestions based on the tastes reflected in your own library.

Statistics dashboard See your reading come to life with reading streaks, per-month charts, and insights into your habits over time.

Citations made easy Generate clean citations in multiple formats for any book in your library — perfect for essays, papers, and bibliographies.

Private by design Ex Libris Lookup collects no personal information and requires no account. Everything you save stays on your device. Book searches are sent only to the Open Library API to fetch results; nothing is logged, sold, or shared. No analytics, no advertising, no tracking — ever. Book data is provided by the Open Library API (openlibrary.org), an open, community-driven catalog of millions of titles. Ex Libris Lookup is not affiliated with Open Library.