How do I validate an IBAN online?

Paste the IBAN into the validator above. It runs the official ISO 13616 mod-97 checksum — the same math banks use — and tells you instantly whether the number is valid, plus the country, check digits, and BBAN breakdown.

What does the IBAN check digits mean?

The two digits after the country code (e.g. the 89 in DE89…) are check digits computed from the rest of the IBAN. They let any bank verify the number is typed correctly before sending money. If even one digit is wrong, the mod-97 check fails.

Can an IBAN validator confirm the account exists?

No. Validation only proves the number is well-formed and the checksum passes — it cannot confirm the account is open or belongs to someone. Always confirm account details with the recipient before sending money.

What is the BBAN in an IBAN?

The BBAN (Basic Bank Account Number) is everything after the 4-character country code + check digits. It contains the bank identifier and the domestic account number, in a format that differs per country.

Why is my IBAN invalid?

The most common causes: a mistyped digit, missing characters (each country has a fixed IBAN length), or a wrong country code. Re-check the number against your bank statement — the validator shows the expected length for the detected country.

IBAN Validator — Check IBAN Numbers Online

What is Iban validator?

IBAN Validator — Validate any IBAN online with this free IBAN validator — ISO 13616 mod-97 check plus country, check digits, and BBAN breakdown. Nothing uploaded.

Implements the ISO 13616 mod-97 algorithm directly: spaces are removed, the IBAN is uppercased, the first four characters are moved to the end, every letter is converted to two digits (A=10 … Z=35), and the resulting number is divided by 97 — a remainder of 1 means the IBAN is valid. Length is checked against the official per-country IBAN registry. Everything runs client-side in your browser; nothing is uploaded or stored.

Why use this iban validator?

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Built for iban validator

Validate any IBAN online with this free IBAN validator — ISO 13616 mod-97 check plus country, check digits, and BBAN breakdown. Nothing uploaded.

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Transparent & honest

Validates format and checksum only — it cannot verify that the account exists or is active.

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Private by design

Everything runs in your browser. Your inputs never leave your device.

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Works everywhere

Fully responsive — perfect on desktop, tablet, and mobile. No app needed.

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Regularly updated

Regularly maintained and reviewed to ensure accuracy.

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Free forever

No accounts, no limits, no watermarks. Use IBAN Validator as much as you need.

How to use IBAN Validator

1Paste or type the IBAN into the box — spaces are fine, they are stripped automatically.
2Run the tool to perform the official ISO 13616 mod-97 checksum validation.
3Read the Result: VALID means the checksum passes; INVALID means a digit is wrong.
4Check the Breakdown for the country code, the two check digits, and the BBAN (bank + account part).
5Copy the Formatted IBAN (groups of 4) for use in bank transfer forms.

What can you do with IBAN Validator?

Iban validator online — Validate any IBAN online with this free IBAN validator — ISO 13616 mod-97 check plus country, check digits, and BBAN breakdown.
Validate iban number — Validate any IBAN online with this free IBAN validator — ISO 13616 mod-97 check plus country, check digits, and BBAN breakdown.
Iban checker — Validate any IBAN online with this free IBAN validator — ISO 13616 mod-97 check plus country, check digits, and BBAN breakdown.
Iban verification — Validate any IBAN online with this free IBAN validator — ISO 13616 mod-97 check plus country, check digits, and BBAN breakdown.

Good to know

Validates format and checksum only — it cannot verify that the account exists or is active.
Country lengths follow the official IBAN registry; newly issued formats may lag until the table is updated.
An IBAN is sensitive banking data — this tool runs fully in your browser and never uploads anything, but avoid pasting real IBANs into tools you do not trust.

How it works

Implements the ISO 13616 mod-97 algorithm directly: spaces are removed, the IBAN is uppercased, the first four characters are moved to the end, every letter is converted to two digits (A=10 … Z=35), and the resulting number is divided by 97 — a remainder of 1 means the IBAN is valid. Length is checked against the official per-country IBAN registry. Everything runs client-side in your browser; nothing is uploaded or stored.

Examples

Valid German IBAN

Status: ok — VALID, country DE (Germany), check digits 89, BBAN 370400440532013000.

Valid UK IBAN

Status: ok — VALID, country GB (United Kingdom), check digits 29.

IBAN with a typo

Status: ok — INVALID: the mod-97 checksum fails (check digits should be 89, not 88).

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