Why can't a cédula de ciudadanía be fully validated?

The Colombian cédula is a plain serial number with no public check digit, so only its format (6–10 numeric digits) can be verified. There is no algorithm to confirm a specific cédula is real.

How accurate is the NIT check digit?

The NIT verification digit uses the official DIAN modulo-11 algorithm with weights 3,7,13,17,19,23,29,37,41,43,…, so the computed digit is exact. It confirms the number is well-formed, not that it is registered.

Colombia Cédula & NIT Validator

Q: Is my document number sent anywhere?

No. Every check runs locally in your browser and the number is never sent anywhere or compared against any registry.

Check a Colombian cédula format and compute the NIT modulo-11 check digit.

Colombia cédula & NIT validator

Validate Colombian identity numbers. The cédula de ciudadanía is a serial number with no check digit, so only its format can be confirmed. The NIT (tax ID) carries a modulo-11 verification digit (DV) defined by the DIAN — this tool computes that DV and tells you whether a provided one matches.

It is privacy-first: every check runs locally in your browser and the number is never sent anywhere or verified against any registry.