Editor: This Applet will help you interconvert, tidy up, and validate ISBN-10 and ISBN-13s (International Standard Book Numbers). It tidies them into standard form with the dashes in the correct places (the rules where they go are quite complicated). It also validates the group number and the check digit. Just paste the raw ISBN-10 or ISBN-13 into the top raw box, click Tidy then copy the tidied ISBN-10 or ISBN-13 from the bottom boxes. A tidied ISBN looks like this: 0-9600688-8-0 or 0-13-625666-X or 978-0-00-000000-2.
