Portuguese IBAN generator

IBANs in Portugal have 25 characters and start with PT. The one below is random, follows the national structure and passes the MOD-97 check, so form validation accepts it. No bank issued it.

Country

Format

Realistic

PT50003564887255359244254

New IBAN

Country PT
Check digits 50
Bank code 0035
Branch code 6488
Account number 72553592442
National check 54

Generate a list Up to 100 IBANs, as CSV, JSON, SQL or plain text

How many

File format

In CSV, JSON and SQL, every IBAN segment (bank, branch, account, check digits) gets its own column.

MOD-97 valid

Realistic mode: real bank code, random account number. No bank issued this IBAN, but it could match a real account by chance. Never use it for payments.

Check an IBAN

Paste an IBAN from any country to check its length, format and check digits.

Without JavaScript, this form opens the full IBAN validator.

Full IBAN validator

Portuguese IBAN format

Length, pattern and the position of each segment in PT IBANs, with a sample IBAN.

IBAN length	25
BBAN length	21
BBAN pattern	`21n`
Structure	`PTkk bbbb ssss ccccccccccc kk`
Example, electronic	`PT50000201231234567890154`
Example, print	`PT50 0002 0123 1234 5678 9015 4`
Letters in the BBAN	None, digits only
National check digits	Positions 24–25
IBAN check digits	Always PT50
SEPA	Member (EPC list, December 2025)
Source	SWIFT IBAN Registry, Release 102 (June 2026)

Position by position

Segment	Positions	Length	Example
Country	1–2	2	`PT`
Check digits	3–4	2	`50`
Bank code	5–8	4	`0002`
Branch code	9–12	4	`0123`
Account number	13–23	11	`12345678901`
National check	24–25	2	`54`

In the pattern, n stands for a digit, a for an uppercase letter and c for a letter or digit. The number before each letter is how many characters that block has.

National check digits

Besides the two IBAN check digits, PT IBANs carry national check digits inside the BBAN, at positions 24–25. They come from the domestic account number and follow a national rule.

They use ISO 7064 MOD 97-10, the same method as the IBAN check digits, applied to the digits in front of them: 98 minus the remainder of that number, times 100, divided by 97.

This generator calculates them with the official algorithm, in both modes, so validators that check them accept the IBANs on this page.

Because of this check, the whole BBAN always leaves the same remainder when divided by 97, so every valid PT IBAN has the same IBAN check digits: PT50.

Source: Banco de Portugal, NIB.

How national check digits work

Real bank codes in realistic mode

In realistic mode, the default, the generator takes the bank code from this list and keeps the account number random, so no bank issued these IBANs. With Realistic off, the bank code is random too.

Bank	Bank code
Caixa Geral de Depósitos	`0035`
Millennium bcp	`0033`
Novo Banco	`0007`
Santander Totta	`0018`
Banco BPI	`0010`
Crédito Agrícola	`0045`
Banco Montepio	`0036`

The branch code stays random.

What to test with PT IBANs

Accept exactly 25 characters for PT, after removing spaces, and reject 24 or 26.
Digits only after the check digits: a validator for PT should reject any letter there.
For a negative test of the national check, change the character at position 24 and recalculate the IBAN check digits (the validator suggests them). The IBAN then passes MOD-97 but fails the national check.
Ready-made invalid values for negative tests: PT50000201231234567890155 (last character changed, MOD-97 fails) and PT5000020123123456789015 (one character missing).
Bank directory checks: by default the generator uses real bank codes such as 0033 (Millennium bcp), and random ones with Realistic off, so you can test a known and an unknown bank.

About IBANs in Portugal

Portuguese IBANs have 25 characters, all digits: a 4-digit bank code, a 4-digit branch code, an 11-digit account number and two national check digits. Those 21 digits are the domestic account number, called the NIB.

Questions about IBANs in Portugal

How long is an IBAN in Portugal?

25 characters: the country code PT, two check digits and a national part (BBAN) of 21 characters.

What does an IBAN from Portugal look like?

For example PT50 0002 0123 1234 5678 9015 4. That is the print format, in groups of four. Forms and files usually take it without spaces: PT50000201231234567890154.

Can Portuguese IBANs contain letters?

No. After the check digits, PT IBANs contain only digits: the BBAN pattern is 21n.

Where is the bank code in Portuguese IBANs?

The bank code, at positions 5–8: 0002 in the registry example. The branch code is at positions 9–12 (0123). By default (realistic mode) the generator uses real bank codes, such as 0035 for Caixa Geral de Depósitos.

Will a test IBAN for Portugal pass validation?

It passes the checks most forms run: country code, length, character format and MOD-97 check digits. The national check digits inside the BBAN are computed with the official algorithm, so a validator that also checks them accepts this IBAN. In realistic mode, the default, the bank code is real too, so a bank directory check accepts it. An account lookup or a payee name check will not confirm it, because the account number is random.

Can I use a generated Portuguese IBAN to sign up for a service or receive money?

No. It is test data that no bank issued to you. Money sent to it is rejected or, if the number happens to belong to someone, reaches a stranger, and using it for a sign-up, a free trial or a direct debit is misuse. Your own IBAN is in your banking app and on your statements.

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