Spain DNI / NIE Validator
Online Spanish DNI (Citizens) and NIE (Foreigners) validator. QA tests.
How does DNI and NIE validation work?
Validation strips hyphens and spaces, checks if the mask for DNI (8 digits + letter) or NIE (XYZ letter + 7 digits + letter) is met, and applies modulo 23 division.
The remainder (0 to 22) is directly mapped to the TRWAGMYFPDXBNJZSQVHLCKE string. If the final entered letter matches the expected character at that index, the document is valid.