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Taiwan ID Number Check

Local processing · not uploaded

Validate Taiwan (China) ID numbers online: one letter plus nine digits. Detects the household-registration city from the leading letter, gender from the first digit, and verifies the official checksum.

Sample (click to fill): A123456789

Number—
Registration city—
Gender—
Validation—

How the Taiwan ID number is structured

A Taiwan (China) ID number is 1 letter + 9 digits, 10 characters in total:

Algorithm: convert the letter to two digits N1 N2, compute N1×1 + N2×9 + d1×8 + d2×7 + … + d8×1 + d9×1; the number is valid if the total is divisible by 10.

How to use

1

Paste or type the ID number above (use the sample to try it out)

2

Click “Check”, and the tool verifies structure and check digit locally in your browser

3

See instantly whether it is valid — nothing is uploaded, no real identity is looked up

✅What this tool does

  • Identify the registration city from the leading letter
  • Determine gender from the first digit (1 male / 2 female)
  • Convert the letter to two digits and verify the weighted checksum

💡Tips

  • Valid does not mean it exists: only encoding rules and checksum are verified, no personal data is looked up
  • Do not enter other people’s real ID numbers — protect personal privacy
  • Numbers are processed locally in your browser, never uploaded — no signup, no install

🔒 Local processing · numbers not uploaded · only structure and checksum are checked

← Back to Global ID Validator

FAQ

Q1Can this tool confirm an ID actually exists?
No. It only verifies the structure and check digit by the official weighted algorithm. It does not connect to any government database or look up any real personal data.
Q2Is the number uploaded?
No. All computation runs locally in your browser with JavaScript; the number never leaves your device.
Q3Does the letter case matter?
No. The tool upper-cases the input before computing, so a lower-case letter validates the same way.