ISSN Validator
Validate International Standard Serial Numbers. Verify format, length, and check digit for journals and periodicals.
Enter an ISSN above to validate
We'll verify format, length, and modulus 11 check digit
What we check
Format Check
Validating ISSN format (7 digits + check character)
Length Verification
Checking for exactly 8 characters
Check Digit Validation
Calculating and verifying modulus 11 check digit
Learn More
Learn how ISSN validation works, the 8-digit format, check digit calculation, and ISSN-L linking.
What Is an ISSN?
An ISSN (International Standard Serial Number) is an 8-digit code used to uniquely identify serial publications such as journals, magazines, newspapers, and periodicals. Managed by the ISSN International Centre in Paris, the system ensures that every continuing publication has a distinct identifier.