CNPJ Validator
Paste a CNPJ to check whether its check digits are correct.
Computed locally in your browser with the CNPJ mod-11 check-digit scheme. Your CNPJ stays only on this page.
Validate a CNPJ check digit
Paste a 14-digit Brazilian CNPJ (NN.NNN.NNN/NNNN-NN) to confirm its two mod-11 check digits and read off the corrected value when a digit is wrong. Each check digit uses the standard cyclic weights over the base digits, and CNPJs whose digits are all identical are rejected the way real validators do. Dots, slashes, hyphens, and spaces are ignored, so both grouped and bare input work as-is. Need to create valid fixtures instead? Try the CNPJ generator.