No. Validation runs in the browser and does not use storage.

CPF/CNPJ Validator

Validate Brazilian CPF and CNPJ check digits, format the number and understand the result locally.

Legitimate use and anti-fraudValidate documents only in legitimate contexts such as software testing, learning and format checks. Never use CPF/CNPJ data for fraud, improper real registrations or identity misuse.

CPF or CNPJ

DocumentCPF

123.456.789-09

12345678909

validCheck digits match.Entered: 09 · expected: 09

The number passed the mathematical check digit rule. This does not confirm registry existence.

CPF/CNPJ can be personal data. Validation is local and does not query government systems or save the number.

Details below

About this tool

Mathematical validation, not registry lookup.

The tool removes punctuation, detects CPF or CNPJ, rejects repeated sequences and calculates check digits to indicate whether the format is coherent.

How to use

Paste the number and read the result card.

Type or paste CPF/CNPJ with or without punctuation.
Check the detected type, status and formatted version.
Copy the formatted version if you need it for tests or documentation.

FAQ

Frequently asked questions

Does it query Brazilian government systems?

No. It only validates check digits and formatting.

Does a valid CPF actually exist?

Are numbers saved?

Does it generate CPF or CNPJ?

Brazilian Documents

Mathematical validation, not registry lookup.

Paste the number and read the result card.

Frequently asked questions

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