Finnish henkilötunnus: test generator and validator
Finnish personal identity code (HETU), also called a Finnish social security number
Generate test identity codes that can never belong to a real person, or check whether a henkilötunnus is valid and what it encodes.
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Generate test identity codes
Every generated code uses an individual number from 900 to 999. That range is used for temporary identity codes (for example in hospitals, before an official code is known) and for testing, and it is not in the Population Information System, so these codes are safe to use as test data.
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How a henkilötunnus is built
| Part | Example | Meaning |
|---|---|---|
| Date of birth | 131052 |
DDMMYY: 13 October ’52 |
| Century sign | - |
+ 1800s, - U–Y 1900s,
A–F 2000s
|
| Individual number | 308 |
002–899 for people; 900–999 for temporary and test codes |
| Check character | T |
The nine digits as one number, modulo 31, looked up in
0123456789ABCDEFHJKLMNPRSTUVWXY
|
Since 2023, people born in the 1900s can also have the century signs U, V, W, X or Y, and people born in the 2000s B, C, D, E or F, in addition to - and A. A validator that only accepts - and A rejects real, valid codes.
Got a whole spreadsheet of these? Scrubsheet finds ID numbers, IBANs, names and emails in Excel and CSV files and anonymizes them, in your browser, without uploading the file.
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