Taiwan National ID Validator
Verify Taiwan citizen ID numbers instantly with format rules, checksum calculation, and an optional random generator.
Enter a Taiwan national identification number to check its format and checksum.
A Taiwan ID must start with a letter followed by nine digits without other symbols.
Output appears here...
Start by entering an ID
Type a Taiwan ID or generate one to see the validation details.
Normalized ID—
Issuing regionUnknown region code
Second digit meaningUnknown code
Check digit—
Checksum sum—
Quick rule summary
- Basic format: 10 characters total: one leading letter followed by nine digits; symbols are not allowed.
- Issuing region letter: The first letter indicates the issuing city or county (A=Taipei City, B=Taichung City, etc.).
- Second digit meaning: Citizen IDs use 1 for male and 2 for female; 8 and 9 mark ARC male and female residents.
- Checksum rule: Convert the letter to two digits (A=10…Z=33), apply weights 1, 9, 8, 7, 6, 5, 4, 3, 2, 1, 1 to each digit, sum them, and ensure the total modulo 10 equals zero.
Disclaimer
- Do not enter real Taiwan ID numbers; use sample data only.
- This tool is for educational reference and is not an official verification service.
- Generated numbers must not be used for impersonation or unlawful purposes.