ISBN Converter
Auto-detect and convert between ISBN-10 and ISBN-13. Validates check digits instantly.
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About ISBN Conversion
ISBN-10 — used for books published before 2007. 10 digits, last digit can be X (representing 10).
ISBN-13 — current standard since 2007. 13 digits, always starts with 978 or 979.
Converting ISBN-10 to ISBN-13 — add "978" prefix, recalculate the check digit.
Converting ISBN-13 to ISBN-10 — only possible for ISBNs starting with "978". Remove prefix, recalculate check digit.
979 prefix ISBNs — cannot be converted to ISBN-10 as there is no equivalent format.
Format Guide
ISBN-10
0-306-40615-2
10 digits, last can be X
ISBN-13
978-0-306-40615-7
13 digits, starts with 978/979
Accepted Formats
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