CPF Checker

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

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About This Tool

This CPF Checker tool allows you to validate Brazilian CPF (Cadastro de Pessoas Físicas) numbers in real-time. Enter any CPF number and our tool will verify its validity by checking the format, calculating the verification digits, and ensuring it follows Brazil's official CPF algorithm. The tool displays detailed results including whether the CPF is valid, the calculated verification digits, and the formatted CPF number. Perfect for developers, businesses, or individuals needing to verify Brazilian tax identification numbers.

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How to Use

Enter a CPF number in the input field (with or without formatting)
Click the 'Validate CPF' button
View the validation results including status, verification digits, and formatted CPF
Clear the input to validate another 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 number issued by the Brazilian Federal Revenue. It consists of 11 digits, usually formatted as XXX.XXX.XXX-XX.

How does the CPF validation algorithm work?

The CPF validation algorithm calculates two verification digits (the 10th and 11th digits) based on the first 9 digits. The tool performs the official Brazilian government calculation to verify if the CPF is mathematically valid.

Does this tool store or transmit CPF numbers?

No, all validation happens entirely in your browser. No CPF numbers are sent to any server or stored anywhere.

What formats does the tool accept?

The tool accepts CPF numbers in any format: with dots and dash (123.456.789-09), with spaces, or just the 11 digits (12345678909). It automatically cleans the input before validation.

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