- CPF Generator
- CNPJ Generator
- CNH Generator
- PIS/PASEP Generator
- RENAVAM Generator
- RG Generator
- Chassis Generator
- Certificate Generator
- Credit Card Generator
- Phone Generator
- CNS Generator
- Voter ID Generator
- AIH Generator
- Phone Generator
- Passport Generator
- Person Generator
- Company Generator
- Address Generator
- State Registration Generator
- SSN (USA)
- EIN (USA)
- SIN (Canada)
- CURP (Mexico)
- RFC (Mexico)
- DNI (Argentina)
- CUIT/CUIL (Argentina)
- RUT (Chile)
- CI (Uruguay)
- CC (Colombia)
- DNI (Spain)
- NIE (Spain)
- NINO (UK)
- Codice Fiscale (Italy)
- Steuer-ID (Germany)
- NIR (France)
- NIF Generator
- SSN Validator (USA)
- SIN Validator (Canada)
- CUIT Validator (Argentina)
- RUT Validator (Chile)
- CI Validator (Uruguay)
- DNI Validator (Spain)
- NIE Validator (Spain)
- Codice Fiscale Validator (Italy)
- Steuer-ID Validator (Germany)
- NIR Validator (France)
- NIF Validator
CPF Generator
Try our CPF generator! You can create various valid numbers and customize your experience using the automatic rotation to generate new CPFs based on the selected time. Additionally, you can choose whether or not to include the mask between the digits.
Also, be sure to check out our CPF validator which ensures the authenticity of the generated numbers. It’s quick and easy!
Understanding CPF and the Generator Algorithm
What is CPF?
The Cadastro de Pessoas Físicas (CPF) is Brazil's individual taxpayer identification number, issued by the Receita Federal. It has 11 digits in the format XXX.XXX.XXX-DD. The first 9 digits are the base number, while the last 2 are mathematically calculated check digits. CPF is required for bank accounts, tax declarations, credit purchases, and access to public services in Brazil.
How does the generation algorithm work?
The CPF algorithm uses the modulus 11 method. The 9 base digits are randomly generated. The first check digit is calculated by multiplying each digit by weights from 10 to 2 (left to right), summing the products, and computing (sum × 10) mod 11 — if the result is 10, use 0. The second check digit follows the same process, now including the first check digit, with weights from 11 to 2.
Why use fictional CPFs in development?
During development of systems that require CPF — such as e-commerces, health systems, government platforms, or ERPs — it is necessary to fill this field to test forms, API integrations, database validations, and registration flows. Using real people's CPFs would be a privacy violation and breach of LGPD. CPFs generated by Help4Dev pass algorithmic validation, making tests more realistic and safe.
Frequently Asked Questions about CPF
Is the generated CPF from a real person?
No. CPFs generated by Help4Dev are created by a mathematical algorithm that produces random numbers with valid check digits. They do not correspond to any person registered with the Federal Revenue Service and exist solely for software testing purposes.
Can I use the generated CPF to open a bank account or make purchases?
No. Generated CPFs are exclusively for use in development and software testing environments. Using a fictitious CPF in real contexts such as bank accounts, purchases, or official registrations is illegal and may constitute identity fraud.
How do I know if my CPF validation implementation is correct?
Use our generator to create valid CPFs and test them in your implementation. Then use our CPF validator to verify that generated numbers pass validation. Compare results with your implementation to ensure both agree.