How do I read the date of birth from a PESEL?

The first six digits are YYMMDD. For people born in 2000 or later, 20 is added to the month: 02 in position 3–4 means February 19xx, 22 means February 20xx.

Can it tell whether a NIP is active for VAT?

No. Use the official VAT taxpayer list (biała lista) for that; this tool only checks the number’s check digit.

Is a number with a correct check digit always real?

No. It is only internally consistent; it may not be assigned to anyone.

PESEL / NIP / REGON Validator — Check Polish ID and Tax Numbers

Validate Polish PESEL, NIP and REGON numbers by their check digits, and read the date of birth and sex from a PESEL. Paste up to 500 numbers, one per line.

Format references

gov.pl — Numer PESEL

Tool page updated: 2026-09-27

PESEL / NIP / REGON Validator — Check Polish ID and Tax Numbers

Numbers (one per line)

Result

Format references

Numbers (one per line)

Result

Guide and example

Related tools

Format references