How is an IBAN validated?

The first four characters move to the end, letters become numbers (A=10 … Z=35), and the resulting number must leave a remainder of 1 when divided by 97.

Does a valid IBAN mean the account exists?

No. The checksum only proves the number is well formed; only the bank can confirm the account exists.

Can I check several IBANs at once?

Yes, put one IBAN per line and every line is validated independently.

Is my data uploaded to a server?

No. This tool runs entirely in your browser using standard web APIs, so your input never leaves your device and nothing is logged or stored on our servers.

Does it work offline and on mobile?

Yes. Once the page has loaded it keeps working without a network connection, and the layout is responsive so it stays usable on phones and tablets.

IBAN Validator & Formatter

Validate IBANs with the mod-97 checksum and country length rules.

Support

Works Offline

Privacy First

No Login

No API

IBANs

One IBAN per line — spaces and dashes are ignored

Validation

Checked against country length rules and the ISO 7064 mod-97 checksum

Valid

Invalid

ValidDE89 3704 0044 0532 0130 00
Country DE · check digits 89 · BBAN 370400440532013000
ValidGB82 WEST 1234 5698 7654 32
Country GB · check digits 82 · BBAN WEST12345698765432
ValidFR14 2004 1010 0505 0001 3M02 606
Country FR · check digits 14 · BBAN 20041010050500013M02606
InvalidDE89 3704 0044 0532 0130 01
Checksum failed (mod-97 does not equal 1) — likely a typo.

About the IBAN Validator & Formatter

Paste one or many IBANs to check them against the ISO 13616 country length table and the ISO 7064 mod-97 checksum. Each result shows the country, check digits, BBAN and a clean four-character grouped format ready to copy.

Examples

German IBAN

DE89 3704 0044 0532 0130 00

Output

Valid — country DE, check digits 89

Keyboard shortcuts

Copy the main outputCtrl / ⌘ + Shift + C
Download the resultCtrl / ⌘ + S
Share this toolCtrl / ⌘ + Shift + S
Reset the inputsAlt + R
Open the tool search paletteCtrl / ⌘ + K

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Frequently asked questions

Version 1.0.0 · Updated 2026-08-17 · Runs entirely in your browser