CPF and CNPJ Generator Online Free - Valid for Testing

CPF and CNPJ generator for system development and testing

During the development of systems, forms and integrations, there is often a need for valid fictitious data to fill in required fields. Using real data from people or companies in test environments is a risky practice. The CPF/CNPJ Generator creates numbers that pass mathematical validation without corresponding to any real registration.

CPF (Individual Taxpayer Registration) follows an algorithm of two check digits calculated from the first nine digits using weights and modulo 11. CNPJ (National Corporate Taxpayer Registry) uses a similar algorithm with 12 base digits plus two verifiers. The tool correctly implements these algorithms, generating numbers that pass any standard validation.

You can generate from 1 to 100 numbers at a time, with or without formatting. The formatted version displays traditional separators (dots, dashes and slashes), useful for filling out forms visually. The unformatted version returns only digits, ideal for inserting directly into databases or API calls.

Important: the generated numbers are mathematically valid but not linked to any real person or company. Use only in development environments, automated testing and demonstrations. Never use fictitious CPF or CNPJ numbers in official documents, contracts or any real situation.