๐ ISBN Validator & Converter
Validates the check digit of an entered ISBN (International Standard Book Number) and converts between ISBN-10 and ISBN-13 formats. Hyphens and spaces in the input are handled automatically.
How to use
- Enter an ISBN-10 (10 digits) or ISBN-13 (13 digits), with or without hyphens.
- The check digit is validated automatically.
- If valid, the equivalent in the other format (10-digit โ 13-digit) is shown as well.
FAQ
What's the difference between ISBN-10 and ISBN-13?
ISBN-13 is the successor to ISBN-10, extended to 13 digits for compatibility with the EAN barcode standard. Books published since 2007 generally use ISBN-13.
Can every ISBN-13 be converted to ISBN-10?
No. Only ISBN-13s starting with the "978" prefix have a corresponding ISBN-10. ISBN-13s starting with "979" have no ISBN-10 equivalent.
How is the check digit calculated?
ISBN-10 validity requires the sum of each digit times a weight from 10 down to 1 to be a multiple of 11 (the last digit can be 0-9 or 'X' representing 10). ISBN-13 uses the same scheme as EAN-13: alternating weights of 1 and 3, with the total required to be a multiple of 10.