Pesel Generator

The tool generates structurally valid PESEL numbers for testing environments. It accepts a birth_date, a gender, and a desired quantity, returning a batch of 11-digit PESEL strings that conform to the official format. Conceptually, it builds the number in stages: encode the year and month with century offsets, append the day, add a four-digit serial that encodes gender, and finally compute a checksum digit using a weighted sum. This enables realistic data validation, form handling, and integration testing without exposing real identities. Beneficiaries include QA teams, developers, and data scientists who need deterministic yet realistic test identifiers for Polish-form data pipelines. Unique value lies in correct century encoding, gender-aware serials, and a verifiable checksum, ensuring compatibility with systems that enforce PESEL format checks. Typical use cases: populate test databases with diverse birth dates and genders, stress test validation rules, and verify import/export workflows. Generated values can be consumed directly in tests or exported to CSV/JSON for automated pipelines.