ISSN Validator
Paste an ISSN to check whether its check digit is correct.
Computed locally in your browser with the ISSN mod-11 check-digit scheme. Your ISSN stays only on this page.
Validate an ISSN check digit
Paste an 8-character ISSN (NNNN-NNNC) to confirm its check digit and read off the corrected value when the digit is wrong. The check character uses the mod-11 weights 8 through 2 over the seven body digits, where a trailing X means 10. Spaces and hyphens are ignored, so grouped input works as-is. Need to create valid fixtures instead? Try the ISSN generator.