DNI Validator

Validate Spanish DNI numbers and calculate the correct control letter instantly.

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About This Tool

This DNI calculator helps you validate Spanish National Identity Document (DNI) numbers and calculate the correct control letter. Simply enter your 8-digit DNI number to verify its format and get the corresponding letter according to official Spanish government standards. The tool performs real-time validation and provides clear results with detailed explanations.

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How to Use

Enter your 8-digit DNI number in the input field (numbers only, no spaces or hyphens)
Optionally enter the letter if you want to validate an existing DNI
Click 'Calculate DNI Letter' to validate and compute the correct control letter
View the results showing whether the DNI is valid and the calculated letter
Use 'Reset' to clear all fields and start over

Frequently Asked Questions

Find Quick Answers

What is a DNI?

DNI (Documento Nacional de Identidad) is the Spanish National Identity Document issued to Spanish citizens. It consists of 8 digits followed by a control letter.

How is the DNI letter calculated?

The letter is calculated by dividing the 8-digit number by 23 and using the remainder to look up the corresponding letter from the official sequence: TRWAGMYFPDXBNJZSQVHLCKE.

What formats does this tool accept?

The tool accepts 8-digit numbers (00000000 to 99999999). Do not include spaces, hyphens, or the letter in the number field.

Can I validate an existing DNI with letter?

Yes, enter the 8-digit number and the letter in the separate field. The tool will verify if the letter matches the calculated one.

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