CNPJ Generator

Generates valid Brazilian CNPJ numbers for testing and data population; suitable for developers, QA, and software testers who need sample company identifiers.

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4.9 / 5.0

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About This Tool

The tool generates syntactically valid Brazilian CNPJ numbers by applying the official checksum algorithm. It supports bulk generation and outputs in either formatted (00.000.000/0000-00) or unformatted (14 digits) forms. This enables testers to seed databases, validate input pipelines, and simulate real-world data flows without exposing real entities.
The implementation creates a 12-digit base randomly, computes two check digits using the standard weights, and yields 14-digit results that pass checksum validation. It can distribute values across a wide range of prefixes to mimic market diversity and avoid obvious duplicates. Outputs are machine-readable and suitable for import into test harnesses, fixtures, or data generation pipelines.
Unique value lies in clean separation of concerns: deterministic seeding for reproducible tests, precise formatting control, and strict adherence to CNPJ rules, ensuring that downstream systems' parsing and validation logic can be exercised thoroughly. Use cases include unit tests, integration tests, demo datasets, and sandbox environments where real identifiers must not be used.

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How to Use

Provide inputs: set the desired count and format (formatted or unformatted).
Run generation: submit and wait for results to appear below.
Retrieve outputs: copy, download, or export to CSV/JSON.
Validate: verify length and that each value passes the checksum check.
Use: seed databases, test integrations, or QA datasets.
Optional: reuse seeds for reproducibility in CI pipelines.

Frequently Asked Questions

Find Quick Answers

What is a CNPJ?

A CNPJ is the Brazilian corporate tax identification number. It consists of 14 digits, formatted as 00.000.000/0000-00, with the final two digits as check digits calculated from the preceding digits.

Are generated numbers real?

Generated CNPJs are synthetic and not registered to real entities. They follow the validated checksum rules, but they should be used only for testing, mocks, or data seeding, not for actual transactions.

Can I choose formatted or unformatted output?

Yes. The tool supports both; you can generate CNPJs with standard punctuation or as plain 14-digit strings to meet integration or parsing requirements.

What are typical use cases?

Use cases include unit tests, integration testing, data seeding for development environments, demonstrations, and validating data pipelines without exposing real company data.

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