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tools4.dev.br

Online Brazilian document validators

Validate CPF, CNPJ, and State Registration numbers online with instant mathematical checks in the browser. These tools help developers and QA teams catch typing mistakes before saving data or testing integrations, without consulting official government databases.

Updated June 2026

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Tools in this cluster

CPF Validator

Check the mathematical consistency of a CPF with immediate feedback.

CNPJ Validator

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

Alphanumeric CNPJ Validator

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

State Registration Validator

Validate Brazilian State Registration numbers by state, with support for SP, MG, and RJ.

State Registration Validator for SP

Online state registration validator for sp for developers, QA, and browser-based testing.

State Registration Validator for MG

Online state registration validator for mg for developers, QA, and browser-based testing.

State Registration Validator for RJ

Online state registration validator for rj for developers, QA, and browser-based testing.

CNH Validator

Validate CNH format and verifier digits for registration tests.

RENAVAM Validator

Validate RENAVAM format and verifier digit without checking official vehicle data.

Mercosur Plate Validator

Validate Mercosur and old Brazilian license plate formats.

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.