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CPF and CNPJ generators for tests

Generate valid fictional CPF and CNPJ numbers for tests directly in the browser. Use these tools to populate staging environments, forms, API fixtures, and QA scripts without relying on real personal or company data.

Updated June 2026

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Tools in this cluster

CPF Generator

Generate valid CPF numbers for software tests in seconds, with or without formatting.

CNPJ Generator

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

Alphanumeric CNPJ Generator

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

Brazilian Fake Person Generator

Generate fictional Brazilian person data with a valid CPF for tests and JSON output.

Brazilian Fake Company Generator

Generate a fictional Brazilian company with valid CNPJ, contact, and address for test environments.

Test Card Generator

Generate fictional card numbers that pass Luhn checks for tests.

UUID and ULID Generator

Generate UUID v4 and ULID identifiers for tests, fixtures, and seed scripts.

Local Password Generator

Generate random passwords in the browser with privacy-focused controls.

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.