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DNI / NIE Letter Calculator — Validate Spanish NIF and NIE

Calculate the control letter of a Spanish DNI or NIE and validate full numbers: 12345678 → 12345678Z, X1234567 → X1234567L. Paste up to 500 numbers, one per line.

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Enter 8 digits to get the letter, or a full DNI/NIE to check it. The check verifies the control letter only, not that the document exists.

Limite: 100.000 unidades UTF-16 por entrada e 1.000.000 por resultado. Veja os formatos e exemplos abaixo.

Resultado

Introduza dados ou carregue um exemplo e execute a ferramenta. O resultado aparece aqui.

Como usar

  1. Paste DNI or NIE numbers, one per line — with or without the letter.
  2. Run the calculation.
  3. Numbers without a letter get it added; complete numbers are marked valid or show the expected letter.

Exemplo

12345678 → 12345678Z
X1234567L → ✓ NIE
12345678A → ✗ expected letter Z

Detalhes e limitações

The letter is the remainder of the number divided by 23, looked up in TRWAGMYFPDXBNJZSQVHLCKE. For an NIE, X, Y and Z count as 0, 1 and 2 before dividing.

Numbers are personal data: they stay in your browser and are not sent anywhere.

FAQ

How is the DNI letter calculated?

Divide the 8-digit number by 23 and take the remainder (0–22). The letter at that position in TRWAGMYFPDXBNJZSQVHLCKE is the control letter: 12345678 leaves 14, which is Z.

Does it work for NIE numbers?

Yes. Replace X with 0, Y with 1 and Z with 2, then apply the same calculation: X1234567 gets the letter L.

Does a correct letter mean the DNI is real?

No. It only shows the number is internally consistent; it does not check any register.

Referências de formatos

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