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Convert between ISBN-10 and ISBN-13 with automatic format detection and check-digit validation. The tool shows a step-by-step breakdown of the check-digit calculation, supports batch conversion of multiple ISBNs at once, and clearly flags entries with invalid check digits. Useful for catalog management, library systems, and bookseller databases that need to work with both formats.
ISBN-10 has been superseded by ISBN-13 since 2007, but older records, citations, and APIs frequently still use the 10-digit format. Any ISBN-13 starting with 978 has an ISBN-10 equivalent; numbers starting with 979 do not.
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