CNPJ/CPF Validator
Free CNPJ and CPF validator for Brazilian tax identification numbers. Validate, format, and generate test CNPJ/CPF numbers instantly.
How to Validate CNPJ or CPF
- 1 Enter the CNPJ (14 digits) or CPF (11 digits)
- 2 Click Validate to check the number
- 3 View the validation result and formatted number
- 4 Generate test numbers for development purposes if needed
Frequently Asked Questions
Is my code or data stored anywhere? ▼
No. All developer tools process data locally in your browser. Nothing is sent to any server or logged.
Can I use these tools offline? ▼
Yes! After the initial page load, most developer tools work without an internet connection.
Are there API limits? ▼
No limits. Since processing happens in your browser, you can use the tools as much as you need.
Is the output compatible with production use? ▼
Yes. Our tools produce standard-compliant output suitable for production environments.
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Last updated: January 15, 2026 · v2.1