CNPJ Validator

The CNPJ Validator is a tool designed to verify if a National Registry of Legal Entities (CNPJ) number is mathematically valid. It applies the official Brazilian Federal Revenue algorithm to calculate the two verification digits (DV) and compares them with the provided digits.

This tool is essential for developers, testers (QAs), and system analysts who need to validate company registration logic in their software. A number validated here will pass format checks, but it is important to remember that this does not guarantee the CNPJ exists or is active in the Federal Revenue database.