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Top tools
NIP Generator
Generate valid Polish NIP (VAT / tax ID) numbers with correct checksums for software testing.
Polish ID Number Generator
Generate valid Polish ID card (dowód osobisty) numbers with correct check digits. Each number follows the official series-and-number format used on Poland's national identity card.
PESEL Number Checker
Enter a PESEL number to extract the birth date, gender, and verify the check digit. Works as both a PESEL checker and validator.
Top articles
When Do You Have to Give Your PESEL in Poland? Your Rights Under RODO
Learn when you're legally required to share your PESEL number in Poland and when you can refuse under RODO (GDPR). A foreigner's guide to data protection.
8 min readHow to Pay a PIT Underpayment in Poland
Owe money after filing your PIT in Poland? Learn how to pay a niedopłata step by step, including deadlines, transfer details, and late payment interest.
8 min readNIP Number in Poland: How to Find, Check, and Validate It
What is a NIP number in Poland? Learn how to find your own NIP, check a company's tax ID, and validate any Polish NIP online.
7 min readLet's build Poland.gg together
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