CNPJ Generator & Validator

Generate and validate Brazilian CNPJ numbers with correct check digits. Fully client-side, no data sent anywhere.

CNPJ Number

Examples of use

Generate valid CNPJ numbers for QA testing of Brazilian systems
Validate user-entered CNPJs in form validation logic
Create test data for financial or government applications

When to use this tool?

When testing Brazilian forms that require CNPJ input
When validating CNPJ entries in QA and automation testing
When generating test data for financial or government systems
When developing CNPJ validation logic

Frequently asked questions

What is a CNPJ?: CNPJ (Cadastro Nacional da Pessoa Jurídica) is the Brazilian corporate taxpayer registration number. It consists of 14 digits, including two check digits calculated using a specific algorithm.
Are the generated CNPJs real?: No. The generator creates CNPJ numbers that pass the check digit algorithm but are not necessarily registered with the Brazilian IRS (Receita Federal). They are for testing purposes only.