MRZ Check Digit Calculator

How it works: MRZ check digits are calculated using weights 7, 3, 1 repeated. Characters are converted: 0-9 = 0-9, A-Z = 10-35, '<' = 0. Click the moon icon for dark mode.

Input Field (e.g., passport number, date):

Check Digit (for validation):

Document Type:

Example Fields

Passport Number: L898902C< → Check: 3
Date of Birth: 740812 → Check: 2
Expiration: 120415 → Check: 9
Personal Number: ZE184226B<<<<<1 → Check: 0
Calculate for: AB1234567

Common MRZ Fields:

Document Number: Usually has a check digit at position 9
Date of Birth: Format YYMMDD, check digit at position 7
Expiration Date: Format YYMMDD, check digit at position 7
Personal Number: Variable length, check digit at end