Brazil CNPJ Validator
Type a Brazilian CNPJ to verify its two check digits and copy the formatted version, or generate a valid test-only example for developers in your browser.
Free, no signup needed. Runs 100% in your browser.
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How to use this tool
- Type or paste the CNPJ with or without punctuation.
- Read the check-digit result.
- Copy the formatted number or generate a test one.
Frequently asked questions
Does a valid CNPJ mean the company is active?
No. This page verifies the two mod-11 check digits only. It cannot query Brazilian government databases, so it cannot confirm registration or company status.
What does the test-number button do?
It creates a random number with correct check digits for development and form testing. It is for testing only and must never be used as a real company identity.
Is my input uploaded?
No. Everything is checked locally in your browser and never leaves the page.
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