Generator Validator CNP

A focused tool for developers, testers, and analysts to generate and validate Romanian CNP numbers, ensuring correctness and compliance with checksum rules.

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< 15ms

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100%

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4.9 / 5.0

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About This Tool

The Generator Validator CNP tool provides two primary capabilities: generate a valid 13-digit Romanian personal numeric code from user-supplied components, and validate an existing CNP against the official checksum rules. It is designed for developers, QA engineers, and data teams needing realistic identifiers for tests.
Conceptually, the tool treats a CNP as a structured sequence of digits: a gender/year indicator, birth date, county code, a serial number, and a checksum digit. It assembles or verifies these parts, then applies the modulus-11 weighted checksum to produce or confirm the 13th digit.
Core value lies in deterministic generation, error checking, and fast test data provisioning. It avoids external data lookups, supports invalid-input handling, and returns a breakdown of all digit groups to aid test case design.
Core features include input validation, deterministic CNP generation, checksum calculation, detailed outputs, and clear error codes. Use cases include unit tests for systems processing Romanian identifiers, data quality audits, and development of validation libraries.

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How to Use

Provide inputs: birth_date (YYYY-MM-DD), county_code (two digits), gender, and an optional serial; or supply a 13-digit CNP to validate.
Choose mode: generate or validate.
Run calculation: tool computes checksum and builds the CNP or checks given CNP.
Review outputs: the resulting CNP, validity status, and a digit breakdown.
Use results: copy to test data, integrate into datasets, or export.

Frequently Asked Questions

Find Quick Answers

What is a CNP?

The Romanian Cod Numeric Personal is a 13-digit national identifier. Digits encode gender, birth date, county, and serials, with the 13th digit serving as a checksum to detect input errors and invalid combinations.

What inputs are required to generate a CNP?

You provide birth date components, gender, county code, and a serial number. The tool assembles the first 12 digits and computes the checksum to produce a valid 13-digit CNP.

How is the checksum calculated?

Compute S as the sum of the first 12 digits multiplied by weights [2,7,9,2,4,1,6,3,5,8,9,7]; r = S mod 11; if r = 10, checksum = 0, else checksum = r. The 13th digit equals the checksum.

Is this tool suitable for production use?

No. It is intended for testing and development scenarios, such as generating realistic test data and validating CNP handling logic. It should not be used to issue official identifiers or in production identity workflows.

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