Check ISBN for Validity

This script accepts a 10 or 13 digit ISBN for input and checks to see if it is a possibly valid ISBN. This doesn't mean that it is an ISBN that has actually been used, just that it could be used as an ISBN.

Enter ISBN:

Please note: If you are entering an old SBN number with only 9 digits you must add a "0" to the beginning of your entry.

Get the Script - Save this file as "isbn-checker.txt" and drop into your website wherever needed.

Just want to try it out? Here are some valid ISBNs to try:

  • 1590593006 / 978-1590593004
  • 0596529945 / 978-0596529949
  • 0596007248 / 978-0596007249
  • 0152049401 / 978-0152049409
  • 015204941X / 978-0152049416
  • 0152051155 / 978-0152051150