Validate an 18-digit (or 15-digit legacy) Chinese ID, check the ISO 7064 MOD-11-2 check digit and extract birth date, gender and region — in your browser.
Paste one or more Chinese ID numbers (18-digit preferred; 15-digit legacy IDs are auto-converted to 18). The 18-digit check uses ISO 7064 MOD-11-2 — the last digit is computed from the first 17 using weights [7,9,10,5,8,4,2,1,6,3,7,9,10,5,8,4,2]; X means 10. The tool extracts the birth date (digits 7-14), gender (17th digit: odd = male, even = female), and province from the leading 2-digit area code. Region lookup covers 34 provincial regions and common city/county codes. Format-only sanity check; never a guarantee of existence.