How to use this tool
Search Open Library by ISBN, title, or author and view up to eight results with title, authors, publication year for the matched record, cover, and citation starter.
Validate, format, and convert International Standard Book Numbers (ISBN-10 and ISBN-13). Essential for authors, publishers, librarians, and secondhand book marketplaces.
💡 3 Quick Steps to Get Started
Input any 10-digit or 13-digit ISBN string with or without hyphens.
Algorithmic validation checks the Modulo-11 (for ISBN-10) or Modulo-10 (for ISBN-13) check digit.
Convert seamlessly between 10 and 13 formats with standard bibliographic hyphenation.
When it helps
Use it to identify a book and start a citation. The UI does not show publisher, ISBN lists, or edition count, and citation style still needs review.
How it works
The GoGo Tools backend first recognizes ISBN-10 or ISBN-13, otherwise runs a text search on Open Library, with up to eight results. The UI renders title, authors, publication year for the matched record, cover, and citation starter. An ISBN match uses the year from that edition's publication date, while text search uses the year supplied by each search record; both appear in the same field. Query results are cached in memory for 86,400 seconds.
Worked example
Enter 9780140328721 to view the title, authors, publication year for the matched record, cover, and citation starter.
Limits and data handling
Open Library fields can be missing, and the citation starter is not a complete citation in a named style. The browser request times out after 20 seconds, and one client is limited to 30 queries per 60 seconds. No matches, rate limits, or provider failures return an empty list or error.
Query text goes to the GoGo Tools backend and Open Library and can remain in a query-keyed memory cache for up to 86,400 seconds. When a cover exists, your browser loads it directly from covers.openlibrary.org. GoGo Tools does not build personal search history, and analytics does not record the query or result.
ISBN Book Standards, Check Digit Math & Catalog Guide
1. Evolution from ISBN-10 to ISBN-13 Standard
The International Standard Book Number (ISBN) uniquely indexes monograph publications. On January 1, 2007, the International ISBN Agency expanded the standard from 10 to 13 digits to unify with the GS1 global supply chain under prefixes 978 and 979.
2. Check Digit Mathematics: Modulo 11 vs. Modulo 10
Legacy ISBN-10 employs a Modulo 11 check algorithm with weights from 10 down to 2, using 'X' to represent a remainder of 10. ISBN-13 utilizes the GS1 Modulo 10 formula with alternating weights (1, 3), always producing a single decimal digit between 0 and 9.
3. Bi-Directional Conversion Mechanics
Converting an ISBN-10 to ISBN-13 prefixes "978", drops the old Modulo 11 checksum, and recomputes the 13th digit using the Modulo 10 algorithm.
4. Open Library & Google Books API Integration
Lookups query authoritative catalog repositories including Open Library and Google Books to fetch bibliographic metadata, authors, and cover illustrations.
Feedback
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Send a suggestion or bug report for this tool.
FAQ
ISBN book lookup: What can I enter?
Enter at least two characters of an ISBN, title, or author; the backend uses at most 240 characters. A value matching ISBN-10 or ISBN-13 is tried as an edition first, otherwise Open Library text search is used.
ISBN book lookup: Which results are shown?
The UI shows up to eight titles, authors, publication year for the matched record, covers, and citation starters. An ISBN match uses the year from that edition's publication date, while text search uses the year supplied by each search record; both appear in the same field. Results are cached in backend memory by query for 86,400 seconds. Publisher, ISBN lists, and edition count are not rendered.
ISBN book lookup: What limitations or errors apply?
Open Library fields can be missing, and the citation starter is not a complete citation in a named style. The browser request times out after 20 seconds, and one client is limited to 30 queries per 60 seconds. No matches, rate limits, or provider failures return an empty list or error.
ISBN book lookup: How are my query and cover handled?
Query text goes to the GoGo Tools backend and Open Library and can remain in a query-keyed memory cache for up to 86,400 seconds. When a cover exists, your browser loads it directly from covers.openlibrary.org. GoGo Tools does not build personal search history, and analytics does not record the query or result.
