CPF Validator

Validate Brazilian CPF (Cadastro de Pessoas Físicas) numbers instantly with our free online tool.

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About This Tool

This CPF Validator Online tool allows you to quickly validate Brazilian CPF (Cadastro de Pessoas Físicas) numbers. CPF is the Brazilian individual taxpayer registry identification used for tax purposes and official documentation. Our tool checks if a CPF number follows the official validation algorithm, verifying both the first and second check digits. Simply enter a CPF number (with or without formatting) and get immediate validation results showing whether the CPF is valid or invalid according to Brazilian government standards.

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How to Use

Enter a CPF number in the input field (you can use
789-09 format or just numbers)
Click the 'Validate CPF' button
View the validation result showing whether the CPF is valid or invalid
If invalid, check the error message for details on what's wrong with the CPF number

Frequently Asked Questions

Find Quick Answers

What is a CPF number?

CPF (Cadastro de Pessoas Físicas) is the Brazilian individual taxpayer registry identification. It's an 11-digit number used for tax purposes, banking, and official documentation in Brazil.

How does the CPF validator work?

The validator checks if the CPF follows the official Brazilian government algorithm. It verifies the check digits (the last two digits) by performing mathematical calculations on the first nine digits.

Can I validate CPF numbers with special characters?

Yes, the tool automatically removes dots, dashes, and spaces from the input. You can enter CPF numbers in formats like 123.456.789-09 or just 12345678909.

What makes a CPF number invalid?

A CPF can be invalid if it doesn't have exactly 11 digits, contains non-numeric characters (after cleaning), has all identical digits (like 111.111.111-11), or fails the mathematical check digit verification.

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