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CPF/CNPJ Validator

Validate Brazilian CPF and CNPJ numbers.

Runs in browser
Validate CPF and CNPJ structure quickly in browser — useful for forms, registrations, and validations before sending to server.

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Fill in the fields and click generate or calculate.

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🪪 CPF Generator
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What does the validator check?

The validator checks whether the CPF or CNPJ structure is valid according to check digits and the correct number length. Validation is mathematical only, with no official database lookup.

How to use

  1. Select CPF or CNPJ.
  2. Enter the number with or without formatting.
  3. Click Validate or use the auxiliary format button.

Frequently asked questions

What does the Utilo CPF and CNPJ validator check?

The validator checks whether the CPF or CNPJ structure is valid according to check digits and the correct number length.

Does the tool query any official agency?

No. Validation is mathematical only, based on CPF and CNPJ formation rules, with no official database lookup.

Can I enter the document with dots and dashes?

Yes. You can type the CPF or CNPJ with or without formatting; the tool handles characters automatically.