CNH Validator

This tool verifies the mathematical validity of a CNH (National Driver's License) number. The validation is based on the algorithms for calculating the two verification digits, which ensure the integrity and authenticity of the document's numeric sequence.

It is an essential tool for developers and testers (QAs) who need to ensure their systems correctly validate the CNH format. A mathematically valid CNH number will pass form validations, but this does not mean the CNH belongs to a real person or is registered with any DETRAN.