DNI Validator - Check if a Spanish ID is valid
Use our online DNI validator to check if a Spanish National Identity Document is valid. Instant verification according to the official algorithm.
DNI Format
The correct format of a Spanish DNI consists of 8 numbers followed by a letter. The letter is calculated from the numbers using a specific algorithm and serves as a control digit to detect errors.
Validation Criteria
- Must have 8 numbers followed by a letter
- The letter must correspond to the result of the official algorithm
- Must not contain special characters or spaces
Validation Uses
- Verify the technical validity of a DNI
- Test document validation systems
- Development of applications with identity verification
Important Notice: This validator only checks the technical validity of the DNI according to the official algorithm. It does not verify if the document actually exists or belongs to a specific person.