PESEL generator (Poland)
A Polish PESEL is eleven digits — encoded date of birth, a serial, and a weighted checksum digit. These test values are synthetic but checksum-valid.
Synthetic · not collision-guaranteed Validate a number →
62011599269
Synthetic PESEL with a valid checksum. Not a real issued number.
Format specification
| Identifier | PESEL |
|---|---|
| Country | 🇵🇱 Poland |
| Format | 00000000000 |
| Length | 11 characters |
| Checksum | Weighted MOD 10 |
| Example | 71042713632 |
| Safe strategy | Synthetic |
| Data quality | Verified against sources |
PESEL: what each part means
| 00 | Last two digits of the year of birth. |
|---|---|
| 00 | Month of birth, offset by century: +0 for 1900s births, +20 for 2000s, +80 for 1800s (so 03 = March 19xx, 23 = March 20xx). These test values use the 1900s form. |
| 00 | Day of birth. |
| 0000 | Serial number; on real PESELs the last of these four digits encodes sex (even = female, odd = male). Test values use random digits. |
| 0 | Check digit: weighted sum (1,3,7,9,…) of the first ten digits, modulo 10. |
Validation regex
Matches the canonical value — strip separators and uppercase first: value.replace(/[^A-Za-z0-9]/g, '').toUpperCase()
^\d{11}$ References
Common questions
Will these pass my validation?
Yes — they are well-formed PESEL values (00000000000) and pass standard format checks, including the Weighted MOD 10 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.