Spanish NIF, NIE and DNI validator
Validate a Spanish DNI (citizen ID), NIE (foreigner ID) or NIF by checking its final control letter. The letter is derived from the numeric part modulo 23, mapped through the official letter table — this tool detects the document type automatically and tells you whether the control letter is correct.
It runs entirely in your browser, so the ID number you type is never uploaded. A structurally valid number is not guaranteed to be one that has actually been issued — this is a format and check-letter validator only.