Value
10 or 13 characters. Hyphens are stripped. X is allowed on ISBN-10.
Result
Type a value or load the sample.
Type a value or load the sample.
Structure
How it works
ISBN-13 (978/979) uses weights 1 and 3. ISBN-10 uses 10…1, and X means 10.
A valid ISBN does not prove the book is in a publisher catalogue.
ISBN-13
978 / 979
13 digits, modulo 10.
ISBN-10
With X
Modulo 11 check.
Group
Prefix
Country / language from the GS1 prefix.
Important:
This is a format check only, in the browser.
Useful notes
- 978-0-306-40615-7 is a classic documentation sample.
- ISBN-10 and ISBN-13 for the same book use different maths.
- Reloading the page clears the field.