ISBN Validator
Validate International Standard Book Numbers (ISBN-10 & ISBN-13) quickly and accurately.
How to Use ISBN Validator
- Enter one or more ISBNs (ISBN-10 or ISBN-13) in the text area.
- Click Validate to check if they are valid.
- Results will show format type and validity status.
- Copy or download the results for later use.
💡 Note: This validator checks only the checksum validity of ISBNs, not whether the book actually exists.
Where to Find the ISBN on a Book
ISBN 978-3-16-148410-0
The ISBN is usually printed near the barcode on the back cover of the book.
Understanding ISBN Structure
An ISBN-13 consists of five parts, each with a specific meaning:
978
Prefix3
Registration Group16
Registrant (Publisher)148410
Publication0
Check Digit
Prefix3
Registration Group16
Registrant (Publisher)148410
Publication0
Check Digit
Example: 978-3-16-148410-0• 978: Bookland prefix • 3: German-speaking countries • 16: Specific publisher • 148410: Unique title/edition • 0: Check digit