ISBN Converter
Convert ISBN-10 ↔ ISBN-13 with check digit validation.
Input
Results appear here…
Convert ISBN-10 ↔ ISBN-13 with check digit validation.
Results appear here…
Publishing workflows still mix ISBN-10 (especially older backlist) with ISBN-13 required by Amazon, Bowker, and most bibliographic databases. When a spreadsheet has `0-306-40615-2` and your API expects 9780306406157, manual conversion invites check-digit errors. This converter transforms formats, validates mod-11 and mod-10 rules, and optionally inserts hyphens for display.
ISBN-10 uses a mod-11 check digit (with X meaning 10). ISBN-13 embeds the book identifier in an EAN-13 barcode — prefix 978 or 979, followed by the core body, with a mod-10 GS1 check digit at the end.
Converting 10 → 13: drop the ISBN-10 check digit, prepend 978 (or 979 for certain ranges), recalculate the EAN check digit. Converting 13 → 10: only possible when the ISBN-13 starts with 978 — strip prefix and check digit, recompute mod-11.
ISBN-10
0-306-40615-2
ISBN-13
978-0-306-40615-7
Submitted ISBN-13
9780306406150 (wrong check digit)
Validation
Invalid — expected check digit 7
ISBN Converter transforms ISBN-10 and ISBN-13 formats, validates check digits, and formats hyphenated display strings for publishers, librarians, and e-commerce book listings.
Paste with or without hyphens. Bulk mode helps clean catalog migrations and marketplace feed preparation.