Hong Kong Identity Card check digit generator

Enter ID (without the check digit)

The ID must be 7 or 8 characters. The last 6 characters must be digits 0-9.

Note: we will not store the ID number submitted. For more on HKID cards, and our call for transparency, click here. To generate the last digit of a HK Business Registration number, click here.

Known single-letter prefixes are ABCDEFGHJKLMNPRSTVWYZ and double-letter prefixes are WX,XA,XB,XC,XD,XE,XG and XH.

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