Polish NIP Validator
Narzędzie sprawdza wyłącznie poprawność matematyczną (sumę kontrolną) numeru NIP — nie weryfikuje, czy NIP jest nadany ani czy podmiot jest czynnym podatnikiem VAT. Status kontrahenta sprawdzisz w oficjalnych rejestrach: Biała lista podatników VAT (podatki.gov.pl) lub wyszukiwarka REGON (GUS).
How to use Polish NIP Validator
Type the 10-digit NIP number. The tool formats it as XXX-XXX-XX-XX and verifies the checksum in real time, showing a green (valid) or red (invalid) result. Copy the formatted number with one click.
Features
- NIP checksum validation (weights 6,5,7,2,3,4,5,6,7)
- Automatic XXX-XXX-XX-XX formatting
- One-click copy
- Real-time result
- 100% in your browser — the number is never sent anywhere
Frequently Asked Questions
What is a NIP number?
NIP (Numer Identyfikacji Podatkowej) is the Polish tax identification number — 10 digits assigned to businesses and taxpayers in Poland.
Does the tool check whether the NIP exists in a registry?
No. It only verifies the mathematical checksum. To check a company's status, use the official registers: the Polish VAT whitelist (podatki.gov.pl) or the REGON search (GUS).
How is the checksum calculated?
The first 9 digits are multiplied by the weights [6,5,7,2,3,4,5,6,7], the products are summed, and the sum modulo 11 must equal the 10th digit.