ISSN Checker
Check the structure and modulo-11 check digit of an ISSN locally without looking up or changing publication metadata.
Privacy: bibliography and DOI utility inputs are processed locally in your browser and are not sent to a citation-processing backend.
Formula
ISSN check: weighted digits 8 through 2 plus check digit must be divisible by 11
Verify the intended serial after verifying the number
- 2049-3630 has a weighted total of 121 under the ISSN rule.
- 121 is divisible by 11, so the check digit is consistent. The intended serial still needs a separate authoritative-record check.
What the result tells you
This arithmetic helps catch transcription mistakes before an identifier is included in a reference or spreadsheet.
Before you use the result
Print and electronic versions can have separate ISSNs. A checksum cannot establish publication quality, current status or the relevance of an article.
References for this method
Useful for
- Journal identifier checks
- Reference cleanup
- Serial metadata review
Questions
Can an ISSN end in X?
Yes. X represents the value 10 when it is the final check digit.
Does this verify which journal owns the ISSN?
No. It validates the number mathematically. Use an authoritative ISSN or library registry to verify publication metadata.