DOCUMENT VALIDATORS
Paste a DNI (8 digits + letter) or a NIE (X/Y/Z + 7 digits + letter) and check whether the control letter is correct.
Also useful if you are looking for: validate spanish dni · nif nie validator · dni control letter
Local processing
LOCAL PROCESSING
The file and text never leave your device.
Paste a DNI (8 digits + letter) or a NIE (X/Y/Z + 7 digits + letter) and check whether the control letter is correct. Click Process, then download or copy the result when it is ready.
It computes the control letter with the official mod-23 algorithm. It checks that the number is well formed; it does not query any registry. Everything happens in your browser.
FREQUENTLY ASKED QUESTIONS
No. The operation runs locally in your browser and PriviTools never receives the content.
No. The tool works directly in modern browsers, with no account and no charge.