IBAN Validator
Type or paste an IBAN to instantly check its country code, length and checksum — with the number formatted into readable groups.
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Your files are processed locally in your browser. They are not uploaded to our servers.
How to use
- Type or paste the IBAN into the field — spaces don't matter.
- Read the verdict: valid, wrong checksum, wrong length or bad format.
- Use the formatted version with spaces for readable documents.
What is this tool?
IBAN Validator checks an International Bank Account Number the same way banks do on entry: it validates the two-letter country code, compares the length against that country's official IBAN length, and verifies the ISO 7064 mod-97 checksum that catches virtually all typos and digit swaps. Everything runs locally in your browser — the IBAN is never transmitted anywhere.
Common uses
- Checking a customer's IBAN before entering it into accounting software
- Verifying you copied an IBAN from an invoice without typos
- Validating IBANs collected through a form before paying out
- Formatting an IBAN into readable four-character groups
FAQ
Does a valid checksum mean the account exists?
No. The checksum proves the number is structurally correct and free of typos, but only a bank can confirm the account actually exists and is active.
Which countries are supported?
All countries in the official IBAN registry — around 70, including every EU/EEA country, the UK, Switzerland and many more.
Is it safe to enter a real IBAN?
Yes. The check runs entirely in your browser and the IBAN is never sent anywhere. An IBAN alone also isn't a secret — it appears on every invoice.
How does the checksum work?
The first four characters move to the end, letters become numbers (A=10 … Z=35), and the resulting number must leave remainder 1 when divided by 97.