How to Use the CNPJ Generator: Complete Guide

The 4Generate CNPJ Generator is a powerful tool for developers, testers, and professionals who need valid CNPJ numbers for testing and system development.

What is a CNPJ?

The Cadastro Nacional da Pessoa Jurídica (CNPJ) is a unique identification document for each Brazilian company. It consists of 14 digits, with the last two being verification digits that guarantee the number's validity. The CNPJ is essential for companies to conduct commercial operations, open bank accounts, and participate in public tenders.

When to use the CNPJ Generator?

Our tool is ideal for:

• Software development: Test forms and validations that require CNPJ
• Integration testing: Validate systems that process company data
• Prototyping: Create example data for interfaces and demonstrations
• Education: Learn about CNPJ structure and validation
• API testing: Validate endpoints that process company information

How to use the tool

Step 1: Access the Generator

Navigate to the CNPJ Generator page on our site.

Step 2: Configure options

The tool offers various customization options:

• Format: Choose between CNPJ with or without formatting (dots, slash and dash)
• Quantity: Generate one or multiple CNPJs at once
• Auto copy: Enable to automatically copy the generated CNPJ

Step 3: Generate the CNPJ

Click the "Generate CNPJ" button and the number will be generated instantly.

Step 4: Copy the result

Use the copy button to transfer the generated CNPJ to where you need it.

Practical example

Let's generate an example CNPJ:

Generated CNPJ: 12.345.678/0001-90

This CNPJ is valid only for testing and development purposes. Never use generated CNPJs for fraudulent or illegal purposes.

CNPJ Validation

All CNPJs generated by our tool pass the official Brazilian Federal Revenue validation algorithm, ensuring that:

• The verification digits are correct
• The format complies with Brazilian rules
• The number is mathematically valid
• Follows the official validation pattern

Differences between CPF and CNPJ

Although both are Brazilian documents, there are important differences:

• CPF: 11 digits, used for individuals
• CNPJ: 14 digits, used for legal entities (companies)
• Algorithm: Each has its own validation algorithm
• Usage: CPF for people, CNPJ for companies

Best practices

1. Use only for testing: Generated CNPJs are only for development and testing
2. Don't share real data: Never use real companies' CNPJs in test environments
3. Respect privacy: Maintain the security of company data
4. Always validate: Use our validator to verify CNPJs when needed
5. Test in isolated environments: Use only in development and staging environments

Common use cases

E-commerce development

When developing e-commerce platforms, you may need to test:

• Supplier company registration
• CNPJ validation in forms
• Integration with validation APIs

Integration testing

For systems that integrate with:

• Government APIs
• Banking systems
• Payment platforms
• ERPs and management systems

Interface prototyping

Create example data for:

• Administrative dashboards
• Business reports
• Registration forms
• Product demonstrations

Conclusion

The 4Generate CNPJ Generator is an essential tool for developers working with Brazilian systems. Use responsibly and always respect company data privacy and security.

For more information, visit our support page or explore other useful tools on our site.