What is an IBAN and how does the MOD-97 checksum work?

An International Bank Account Number (IBAN) is a standardized bank account identifier used in 90+ countries. It starts with a 2-letter country code, followed by 2 MOD-97 check digits, then a country-specific BBAN. To validate, we move the first 4 characters to the end, convert letters to numbers (A=10, B=11, ..., Z=35), and compute the integer modulo 97 — if the result is 1, the IBAN is structurally valid.

How many countries does the IBAN registry cover?

Our bundled ISO 13616 registry covers 70+ IBAN-enabled countries with each country's total IBAN length and BBAN segment structure (n = digits, a = uppercase letters, c = alphanumeric). Examples: Germany (DE, 22 chars, 18n), France (FR, 27 chars, 10n 11c 2n), UK (GB, 22 chars, 4a 6n 8n), Saudi Arabia (SA, 24 chars, 2n 18c).

Can I generate test IBANs for sandbox use?

Yes. Pick a country and we'll generate a structurally-valid IBAN with the correct length, BBAN character types, and MOD-97 check digits. These IBANs are sandbox/test only — they pass MOD-97 validation but are not assigned to real bank accounts. Never use them for actual financial transactions.

Are my IBANs uploaded to a server?

Never. Every MOD-97 calculation, structural check, and decode runs 100% client-side in your browser. There is no server endpoint, no analytics on the input field, and no logging of IBAN data. The history feature stores only operation metadata (counts + timestamps) in localStorage on this device — never the IBANs themselves.

What extra features does this tool have versus other IBAN tools?

(1) 70+ country ISO 13616 registry with BBAN structure. (2) MOD-97 checksum validate/generate. (3) Structural breakdown (bank code, branch code, account number where applicable). (4) Print format (4-char groups) and electronic format (no spaces). (5) Country picker with format specimen. (6) Batch validate up to 10k rows. (7) Batch generate up to 1k IBANs per click. (8) Color-coded component breakdown. (9) Per-country length validation with helpful hints. (10) Question-mark autocomplete for missing digits. (11) CSV export of batch results. (12) localStorage history (max 20, no IBANs stored). (13) Shareable URL with country + count + format encoded.

Developer Runs in your browser

IBAN Generator & Validator

Generate valid test IBANs for 70+ countries and validate/decode any IBAN with MOD-97 checksum, per-country length rules, BBAN structural breakdown, batch processing, and print/electronic formatting. 100% client-side — test/sandbox IBANs only, structurally valid but unassigned.

100% Private Works Offline Instant

Generated IBANs are structurally valid (pass MOD-97 + length + character-type checks) but UNASSIGNED. They are for testing/development only — never use them for real financial transactions.

100% client-side. MOD-97 + structural validation all run locally — IBANs are never transmitted or logged. History stores only metadata (counts + timestamps), never the IBANs themselves.

Display format

Shareable link

Generate test IBANs

Country (79 in registry)

Count (max 1000)

Seed (deterministic)

DEGermany22 charsBBAN: 18n

Specimen: DE00 0000 0000 0000 0000 00

DE28 3514 0042 6695 5934 16

DE84 0620 1397 8599 3392 18

DE26 6264 5673 3861 8920 90

DE54 1488 7700 4311 2408 48

DE37 7563 0976 8295 3453 69

DE51 8354 2040 4558 4211 18

DE08 8601 2396 0373 0269 18

DE45 8733 2343 3397 7226 07

DE66 5963 7917 5090 2311 69

DE32 7143 4242 7130 3136 36

Country registry (79 IBAN-enabled)

100% client-side. MOD-97 validation, BBAN structural checks, and IBAN generation all run in your browser. No server, no network, no telemetry on the input field. IBANs are never stored — only operation metadata lives in localStorage (max 20).

How to use

Enter your input in the tool above.
Adjust any options to your preference.
Use the Copy or Download buttons to save the result.
Everything happens locally — your data never leaves your browser.

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