Check if a CNPJ is mathematically valid in seconds. Validation done directly in your browser. No data is stored. Technical, educational and test support use.
⚠️ This tool only performs mathematical validation of the digits of the CNPJ. It does not check the registration status with the IRS nor does it guarantee that the CNPJ is active. Use only for testing, technical and operational support. Do not use for fraud or any illegal use.