How does IBAN validation work?

The tool checks the country code (2 letters), verifies the total length matches that country's standard, and validates the MOD-97 checksum — the same algorithm banks use.

What countries are supported?

All countries that use IBAN — over 80 countries including all of Europe, the Middle East, and parts of Africa and the Caribbean.

Is my IBAN sent to a server?

No. Validation runs entirely in your browser.

What's the difference between formatted and electronic?

Formatted has spaces every 4 characters (DE89 3704 0044 0532 0130 00) for readability. Electronic is the same without spaces (DE89370400440532013000) used in bank systems.

IBAN Formatter & Validator

Format, validate and verify IBAN bank account numbers. Check length, country code and checksum. Free online tool.

Frequently asked questions

IBAN Formatter & Validator — Free Online

Paste an IBAN and instantly see if it's valid. The tool checks the country code, length, and MOD-97 checksum. Also formats it with proper spacing.

Full validation

Country code, length, and MOD-97 checksum verification.

Auto-format

Adds spaces every 4 characters for readability.

Country detection

Shows the country name from the IBAN code.