PESEL validator
Check the checksum and encoded date without sending the number.
Sources and adopted values
How do I use this page?
- Enter data and choose a variant.
- Click Calculate and inspect the breakdown.
What this page does not do: Formal validity does not confirm assignment or identity. The number is excluded from URLs, browser storage and analytics. Export explicitly copies the data.
Further reading
Theory — PESEL validator
Weights: 1, 3, 7, 9, 1, 3, 7, 9, 1, 3. Check digit = (10 − sum modulo 10) modulo 10. Month, century and calendar date are validated.
Frequently asked questions
How does the calculation work?
Weights: 1, 3, 7, 9, 1, 3, 7, 9, 1, 3. Check digit = (10 − sum modulo 10) modulo 10. Month, century and calendar date are validated.
What are the limitations?
Formal validity does not confirm assignment or identity. The number is excluded from URLs, browser storage and analytics. Export explicitly copies the data.
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