Verify the format of a Chinese ID card and extract birth date and gender.
The Chinese Resident Identity Card (居民身份证) is a crucial 18-digit identification number. The number is not random; it contains embedded logic including the citizen's province code, birth date, sequence code (which denotes gender), and a mathematical checksum digit.
This validator checks the mathematical validity of the ID number algorithmically. It does not look up citizen databases. Because the validation is written in JavaScript, the number you type never leaves your browser, ensuring complete privacy.