HETU generator (Finland)
A Finnish personal identity code (HETU) is date of birth, a century marker, a serial, and a check character. These test values use the 2000s marker (A) and carry a valid check character, but are synthetic.
Synthetic · not collision-guaranteed Validate a number →
180152A8829
Synthetic HETU with a valid check character (2000s form). Not a real issued code.
Format specification
| Identifier | Henkilötunnus (Personal identity code) |
|---|---|
| Country | 🇫🇮 Finland |
| Format | 000000A000A |
| Length | 11 characters |
| Checksum | Mod 31 check char |
| Example | 200495A093M |
| Safe strategy | Synthetic |
| Data quality | Verified against sources |
Henkilötunnus: what each part means
| 000000 | Date of birth as DDMMYY. |
|---|---|
| A | Century marker: + for 1800s births, − (or U–Y) for 1900s, A (or B–F) for 2000s. These test values use A. |
| 000 | Individual number 002–899; on real codes odd means male and even means female (900+ marks temporary codes). Test values use random values in range. |
| A | Check character: the nine digits (date + individual number) modulo 31, indexed into the official table 0123456789ABCDEFHJKLMNPRSTUVWXY. |
Validation regex
Matches the canonical value — strip separators and uppercase first: value.replace(/[^A-Za-z0-9]/g, '').toUpperCase()
^\d{6}A\d{3}[0-9A-FHJ-NPR-Y]$ References
Common questions
Will these pass my validation?
Yes — they are well-formed Henkilötunnus values (000000A000A) and pass standard format checks, including the Mod 31 check char checksum.
Could one belong to a real person?
These are synthetic values. They are format-valid but not drawn from a guaranteed reserved range, so use them only for testing.
Can I generate many at once?
Increase the count, or use the free API and CSV/JSON export for large datasets.
For software testing only. These numbers are synthetic and must never be used
for real-world identification, applications, or to impersonate anyone.