NIB Validator

Portuguese bank account number (NIB) — 21 digits with bank check digits.

Portugal Validation

Try the demo NuGet: DocumentNumber.Portugal.BankAccountNumber.Validator

How validation works

The validator checks the 21-digit NIB structure and the bank-specific check digits defined by Banco de Portugal.

Install the package

bash

dotnet add package DocumentNumber.Portugal.BankAccountNumber.Validator

Validator in C#

Program.cs

using DocumentNumber.Portugal.BankAccountNumber.Validator;

var validator = new BankAccountValidator();
var isValid = validator.Validate("000201231234567890154");

Console.WriteLine(isValid ? "Valid" : "Invalid");

Live example

000201231234567890154 — a real NIB value accepted by the validator

Try NIB validation

Runs the exact same library code your application uses. Nothing you enter is stored.

Frequently asked questions

What is NIB?

Portuguese bank account number (NIB) — 21 digits with bank check digits.

How does NIB validation work?

The validator checks the 21-digit NIB structure and the bank-specific check digits defined by Banco de Portugal.

How do I install the NIB validator package?

dotnet add package DocumentNumber.Portugal.BankAccountNumber.Validator

Is the value I enter in the demo stored?

No. Demo inputs are processed in memory for the current request only and are never persisted or shared.