Question 1

Is the CPF generated by this tool valid?

Accepted Answer

Yes. The generated CPF is mathematically valid because it follows the official check digit calculation algorithm (modulus 11). This ensures it will pass any system validation, but it is important to remember that it is fictitious and does not correspond to a real person.

Question 2

Can I use the generated CPF for registrations or purchases?

Accepted Answer

No. Using a generated CPF for purposes other than testing, study, or software development is discouraged and may be considered illegal. The tool was created to assist developers and QAs, not for fraudulent activities.

Question 3

What does it mean to generate a CPF by state?

Accepted Answer

The ninth digit of the CPF indicates the tax region where the document was originally issued. By selecting a state in the 'Origin State' filter, our tool generates a CPF whose ninth digit corresponds to that specific region (e.g., SP = 8, RJ/ES = 7, RS = 0). This is useful for testing systems with logic based on the CPF's origin.

Question 4

How does the CPF Generator work?

Accepted Answer

The tool generates the first eight digits of the CPF randomly. The ninth digit is defined randomly or based on the state you select. Finally, the last two digits (check digits) are calculated using the official algorithm. This results in a number that, although fictitious, is always mathematically valid.

Question 5

Is it safe to use this tool?

Accepted Answer

Yes. Box4Dev does not store any of the generated data. All operations are performed in your own browser (client-side), ensuring total privacy and security.

CPF Generator

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About the CPF Generator by State

Frequently Asked Questions (FAQ)