Library of Congress

Preassigned Control Number Program

The Library of Congress > Preassigned Control Number Program


ISBN Converter

  1. Enter a 10-digit or 13-digit ISBN in the "Original ISBN" box.
  2. To convert with hyphenation, check the "Hyphenate ISBNs" box.
  3. Click the "Convert ISBN" button to validate and convert the number.

Original ISBN:   
Converted ISBN:   


        Hyphenate ISBNs