CPF Brasil generator

The CPF Brasil generator creates synthetic Brazilian CPF numbers for testing, validation, and data seeding workflows. It is designed for software developers, QA engineers, data teams building forms, registrations, or data pipelines that require realistic, check-digit valid CPFs without using real identifiers. The tool emphasizes reproducibility where needed, offering both random generation and seed-based deterministic sequences to support repeatable test scenarios.

Conceptually, the generator follows the official CPF arithmetic: the first nine digits are produced and two final digits are computed using modulus 11 with specific weights. The output can be formatted as the standard 000.000.000-00 string or returned as a plain 11-digit sequence. Advanced options enable controlled formats and export options for integration into test fixtures.

Inputs control scale and format: a batch size, a choice of formatting, an optional seed, and an output style such as newline-delimited, CSV, or JSON. Outputs are simple strings representing CPFs; the tool ensures the digits align with the 11-digit length and the check digits validate under the algorithm. It is suitable for unit tests, data generation pipelines, and performance testing.

Key differentiators include deterministic seeding, strict adherence to the CPF check-digit algorithm, and flexible export formats. By focusing on testing needs, it avoids real-person data while producing realistic data shapes. Use cases span form validation testing, mock data sets for development environments, and automated QA checks that require Brazil-specific identifiers.