Validate ISSN

Validate an eight-character ISSN and calculate its final check symbol.

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ToolISSN Validator
Input
Output
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How it works

Separators are removed, the first seven characters are weighted 8 through 2, and the remainder modulo 11 determines the final character; remainder ten is represented by X. The normalized value is formatted with a hyphen.

  • Eight characters and X follow ISSN.
  • Separator removal accepts catalogue and citation forms.

Worked example

Valid ISSN
Validate a valid ISSN (Hearing Research journal)
Input
											0378-5955
Output
												Valid ISSN: 0378-5955

When to use this

Journal catalogues, library metadata, and publisher records validate serial IDs.

Edge cases

  • X is allowed only as the final check character.
  • Remainder ten produces X rather than a digit.
  • Eight characters can still fail the weighted checksum.

References