ISBN Validator and Converter

À propos de ISBN Validator and Converter

This validator checks ISBNs, the numbers printed on books. Paste them one per line, with or without hyphens or spaces, and with or without the letters ISBN in front, and the check digit of each is tested. The message gives the count of numbers that passed, so a long catalogue can be checked at a glance.

Every valid number is shown in its other form too. An ISBN-10 gets its ISBN-13 form by adding 978 at the front and working out a new check digit, and an ISBN-13 that starts 978 gets back its ISBN-10 form. A number that fails is reported with the digit it should end in, which usually points straight at the typing mistake.

The tool checks that a number is correctly formed, which is the useful first test for a spreadsheet of titles or an import file. It does not look anything up, so a pass does not prove that a book exists or tell you its title. Results are shown as plain digits without hyphens, because the hyphen positions depend on the publisher range and are not needed for the check.

Comment utiliser ISBN Validator and Converter

1. Paste your ISBNs, one per line. Hyphens, spaces and an ISBN prefix are fine.
2. Read whether each is valid, and the other form shown beside it.
3. Check the count in the message.
4. Fix any that are marked using the digit suggested, then copy the results.

Usages courants

• Checking ISBNs in a book list, stock file or library catalogue
• Converting old ISBN-10 numbers to ISBN-13 for a retailer or a form that needs the newer length
• Finding a typing mistake in an ISBN copied by hand
• Preparing numbers for a listing or an import that only accepts ISBN-13
• Checking a reading list before sending it to students
• Confirming that a number from a scan or a photo was read correctly