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CNPJ Validator

Validate the mathematical structure of CNPJ numbers in numeric or alphanumeric format.

Tipo de CNPJ

A validação confere formato e dígitos verificadores. Ela não consulta a Receita Federal nem confirma existência de empresa.

What is CNPJ Validator?

Updated June 2026

Validate the mathematical structure of CNPJ numbers in numeric or alphanumeric format.

How to use it?

  1. Fill in the main fields required by the tool.
  2. Run the action to generate, validate, format, or convert the content.
  3. Review the structured result and copy it when needed for tests, documentation, or homologation.

Examples

Formatted input

Use a representative value for your development or QA scenario and verify the generated output.

Plain input

Use the example value shown in the Portuguese content to test the same local validation rule.

Rules and limitations

  • Processing runs locally in the browser whenever the tool allows it.
  • Generated data is intended for tests, demos, fixtures, and development environments.
  • The result is technical support and does not replace official checks when those are required.
  • User-provided input and generated output are not translated or modified when switching languages.

Frequently asked questions

Are the data sent to a server?

No. The tool follows the Tools4.Dev.Br privacy pattern and runs the processing in the browser whenever possible.

Can I use the result in production?

Use the result as technical support and validate your product rules. For official data, always use the appropriate government, financial, or business source.

Does switching language change my input or generated result?

No. The language selector changes interface labels and metadata only; pasted, typed, copied, or generated content is preserved.

Do I need an account?

No. The tool is free to use and does not require registration for normal browser-based workflows.

Related tools

CNPJ Generator

Generate valid CNPJ numbers for tests in numeric or alphanumeric format.

Alphanumeric CNPJ Validator

Validate alphanumeric CNPJ values with or without mask and check verifier digits.

Alphanumeric CNPJ Generator

Generate valid alphanumeric CNPJ values for tests, with letters and numbers in the first 12 positions.

CPF Validator

Check the mathematical consistency of a CPF with immediate feedback.