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—

Weighted sum—

Quick rule summary

Basic format: One uppercase letter followed by nine digits without spaces.
Region letter: The first letter maps to a Taiwanese city or county, such as A for Taipei City, B for Taichung City.
Second digit: Digit 1 denotes male citizens, 2 female citizens. Digits 8 and 9 are used on ARC resident certificates.
Checksum rule: Convert the letter to two digits, multiply by weights (1,9,8,7,6,5,4,3,2,1,1), add them up, and the total must be divisible by 10.

Disclaimer

Do not enter real personal 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.