The book industry is changing from 10 to 13 digit ISBNs in January 2007. Use this ISBN / EAN conversion tool, to convert between these two formats.

* Please note that only ISBN-13 beginning with ‘978’ can be converted to ISBN-10. ISBNs issued from January 2007, with different preceding digits, will not be convertible as the resulting ISBN-10 would not be a unique identifier.

Or use a 3rd Party validation site