IBAN validator

Catch a typo before the payment bounces

An IBAN, the International Bank Account Number, is a long string of letters and digits that identifies a bank account in a standard way across many countries. One wrong character and a transfer can be rejected, delayed or sent to the wrong place. The good news is that IBANs contain built-in check digits, so most typing errors can be detected before you send anything. This tool runs those checks for you.

What is checked

• The format: two letters for the country, two check digits, and then the national account number.
• The length: each country has a fixed length. Spain has 24 characters, Germany 22, France 27, and so on. A missing or extra character is reported with the expected length.
• The check digits: the mod-97 test defined by the standard, which detects any single wrong character and almost all swapped or missing ones.

Spanish accounts in detail

A Spanish IBAN contains the old 20-digit account number: four digits for the bank, four for the branch, two national control digits and ten for the account itself. If you enter a Spanish IBAN, the tool splits it into those parts and also checks the two national control digits, which gives a second, independent check.

Batches

Paste a list of IBANs, one per line, and the tool tells you which ones pass, so you can check the account list in an invoice or a payroll file before uploading it to the bank.

Formatting

IBANs are printed in groups of four characters to make them easier to read and copy, but banking forms often want them without spaces. The result offers both forms with a copy button.

What it does not do

A valid IBAN is only correctly formed: the tool does not know whether the account exists, is open or belongs to the person you expect. Only the bank can confirm that. Numbers are checked in your browser and are not sent anywhere. To generate a QR code for a bank transfer, use the QR code generator.