CPF (Individual Taxpayer Registry) Validator
Check if a CPF is valid. Validation is performed using the official check digit algorithm.
ℹ️ How it Works
The CPF is validated using an algorithm that checks the two check digits:
- The first digit is calculated by multiplying the first 9 digits by weights from 10 to 2
- The second digit is calculated by multiplying the first 10 digits by weights from 11 to 2
- CPFs with all identical digits are considered invalid
- To verify the validity of a CPF with the Federal Revenue, access the official website: CPF Consultation - Federal Revenue
Facts about the CPF Validator
- The CPF Validator checks the integrity of the 11-digit number.
- The validation uses the official Modulo 11 algorithm.
- The tool identifies CPFs with invalid check digits.
- The tool does not verify the status of the CPF with the Federal Revenue.