1. What is CPF?

CPF (Cadastro de Pessoas Físicas) is the Brazilian individual taxpayer registry identification. It's an 11-digit number with two verification digits calculated using a weighted sum algorithm.

2. How Does CPF Validation Work?

The CPF validation uses the following algorithm:

Where:

• First digit: Sum of (digit × weight) mod 11, where weights are 10 to 2
• Second digit: Sum of (digit × weight) mod 11, where weights are 11 to 2
• If remainder is less than 2, verification digit is 0
• Otherwise, verification digit is 11 minus remainder

3. Importance of CPF Validation

Details: CPF validation is crucial for identity verification in Brazil. It's used for tax purposes, banking, employment, and many official transactions.

4. Using the Calculator

Tips: Enter the CPF number with or without formatting (000.000.000-00 or 00000000000). The calculator will validate the verification digits.

5. Frequently Asked Questions (FAQ)

Q1: What does CPF stand for?
A: CPF stands for Cadastro de Pessoas Físicas (Natural Persons Register).

Q2: Is CPF the same as CNPJ?
A: No, CNPJ is for companies (Cadastro Nacional da Pessoa Jurídica) while CPF is for individuals.

Q3: Can two people have the same CPF?
A: No, each CPF is unique to one individual in Brazil.

Q4: What happens if my CPF is invalid?
A: An invalid CPF cannot be used for official transactions and may indicate data entry errors or fraud.

Q5: Are there known invalid CPF patterns?
A: Yes, CPFs with all identical digits (111.111.111-11, etc.) are automatically invalid.