National ID Validator
Instantly verify or generate national identification numbers for the US, Brazil, China, and 30+ other countries with our secure format toolkit.
Validator
Cross-Country Check
Generator
Regional Samples
Understanding National ID Systems
A National Identification Number is used by governments to track citizens, permanent residents, and temporary residents for taxation, health care, and other government-related functions.
- US Social Security Number (SSN)
- Brazil Cadastro de Pessoas Físicas (CPF)
- China Resident Identity Card
Why Use a Validator?
Validation ensures data integrity in systems by checking:
Privacy & Security Notice
Client-Side Only
All validation and generation happen locally in your browser. We never store, transmit, or see the identification numbers you enter.
Educational Use
This tool is designed for developers, testers, and educational purposes to understand identity number structures globally.
Frequently Asked Questions
What is an SSN?
The Social Security Number is a 9-digit number issued to U.S. citizens, permanent residents, and temporary residents for tracking individuals for social security purposes.
How does the CPF validator work?
Brazil's CPF uses a two-digit checksum at the end of an 11-digit number. Our tool applies the official Modulo 11 algorithm to verify these digits.
Can this tool detect fake IDs?
This tool validates the mathematical format and structure. It cannot verify if a number is assigned to a living person or if the document is authentic.
Are the generated IDs real?
No. The generator creates random numbers that follow the correct structural rules. They are for testing and simulation only.