Softonic

IBAN Validator

Step 1 / 333%

: · :

Check an IBAN locally for a registered country prefix, exact national length, BBAN letter-and-digit structure and MOD 97-10 check digits. Your input stays in this browser and is erased before any funnel page change. Passing these checks does not prove that an account exists, is open or belongs to the intended recipient.

How to check an IBAN

  1. 1

    Paste the IBAN

    Electronic form or print form with spaces is accepted. The characters never leave this page.

  2. 2

    Review four local checks

    The validator compares the prefix, length and BBAN structure with the registry, then computes MOD 97-10.

  3. 3

    Confirm before paying

    Check the IBAN and recipient independently with your bank or the recipient.

What an IBAN contains

An International Bank Account Number starts with a two-letter country or territory code and two check digits. The remaining Basic Bank Account Number (BBAN) follows a fixed national pattern. Each registry entry specifies both the total length and which BBAN positions must contain digits, letters or either. The maximum IBAN length is 34 characters.

SWIFT is the Registration Authority for ISO 13616. This validator bundles the 89 prefixes and official test examples in the SWIFT IBAN Registry, Release 102 (June 2026). It does not contact SWIFT, a bank or another service while checking your input.

Electronic and print formats

Electronic IBANs contain no spaces or special characters. Print form groups the same characters in blocks of four for easier reading. The registry’s British example is GB29NWBK60161331926819 electronically and GB29 NWBK 6016 1331 9268 19 in print. Spaces are removed locally; punctuation, non-Latin lookalikes and localized digits are rejected rather than silently changed.

How MOD 97-10 is checked

For the checksum test, the first four characters move to the end and letters become values from 10 for A through 35 for Z. The resulting decimal sequence is far too long for safe ordinary integer conversion, so this tool calculates the remainder one digit at a time. The check passes only when the final remainder is 1. This follows the MOD 97-10 scheme referenced by ISO 13616 and defined by ISO/IEC 7064.

Local check What it can detect What it cannot prove
Registered prefix A country code absent from Release 102 That an account exists in that country
Exact length Missing or extra characters That every copied character is correct
BBAN structure A letter where digits are required, or the reverse A bank, branch, BIC or account holder
MOD 97-10 Many typing and transposition errors Account status, ownership or ability to receive funds

Why independent confirmation still matters

A mathematically consistent IBAN can be invented, closed, unissued or associated with someone other than the intended recipient. Fraudsters can also substitute a different but correctly formed IBAN. Before sending money, compare the details through a trusted channel and use any beneficiary or account-confirmation service offered by your bank. Common failures include omitting one character, swapping adjacent characters, pasting a non-ASCII lookalike and using details copied from an outdated invoice.

Frequently Asked Questions

No. Validation and formatting happen in your browser. The IBAN is not sent to our servers, put in the URL or saved, and it is erased before a funnel page change.

No. It proves only that the registered format, length, BBAN structure and MOD 97-10 check digits are internally consistent.

It is the check-character system used for IBAN check digits. A rearranged and numerically expanded IBAN must have a remainder of 1 when divided by 97.

ISO 13616 allows different fixed BBAN structures by country. Release 102 lengths range from 15 to 33 characters.

Yes. Ordinary and Unicode whitespace used between print groups is removed. Hyphens, punctuation and lookalike Unicode letters or digits are rejected.

No. The bundled data contains only format rules needed for local validation, not current bank, branch or BIC reference data.

No. It includes all 89 prefixes in SWIFT IBAN Registry Release 102, including registered countries and territories outside SEPA.

Related Tools

ASCII Table Reference

Full ASCII table from 0 to 127 with decimal, hex, octal, binary, standard names and HTML numeric-reference notation, including NUL, LF and DEL.

Color Palette Generator

Generate monochromatic, analogous, complementary, triadic or tetradic color palettes from a base HEX color and export copy-ready CSS variables.

HTML Character Reference

Searchable list of HTML entities, their named and numeric codes, and a one-click copy for special characters and symbols.

HEX Color Picker

Pick or enter a HEX colour and get RGB, HSL, approximate CMYK, relative luminance and contrast ratios against white and black.

FPS Counter

Measure browser FPS with requestAnimationFrame, smoothing, min/max frame rate, warnings and an optional graph. Runs locally with no upload or API.

JSON Formatter

Paste JSON to pretty-print with 2 or 4 spaces, minify it to compact output, or run a quick syntax check before copying the result.

Tool available in other languages