IBAN validator and converter

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All tools › Identifiers and check digits

IBAN validator and converter

The check that catches a mistyped account before the payment leaves — fifty-one countries, and the Slovak and Czech national forms.

It runs entirely in this browser tab: what you type is never uploaded, and the tool makes no network request while it works. Open your browser's network panel and try it — nothing leaves the page. There is no sign-up and no limit beyond what your own browser can hold.

Settings

What to do
Choices: Check, To the national form, From the national form.
Country
Only Slovakia and Czechia: guessing at a third country's layout is how a payment reaches the wrong account.
Print in groups of four
How it is printed on a document. Off gives the form a machine wants.

How to use it

  1. Paste your text into the box above, or open a file.
  2. Adjust the settings beside it until the result is what you wanted.
  3. Copy the result, or save it as a file. The result updates as you type.

Questions

Is what I type uploaded anywhere?
No. This page carries the whole tool as WebAssembly and runs it on your own device. Nothing you type is sent anywhere, and there is no network request to make while it works.
How exact is the arithmetic?
Exact, in decimal, for everything the tool was given: no value here is put through floating point on the way to the answer. Where there is a genuine ceiling — thirty-nine digits for the number-theory tools, a fixed number of places for a repeating fraction — the tool says the limit rather than quietly truncating.
Can I get this result again later?
The settings travel in the page's address, after the #, so a link reproduces them exactly — and the fragment of an address is never sent to a server. Your last settings are also remembered on this device, which is worth knowing before you paste a number you would not want left there.
Is there a version that is not a web page?
Yes. The same tools are built as a desktop application from the same code, with a save dialog instead of a download and no network code at all.

Other tools for identifiers and check digits

Check digit calculator
Luhn, GTIN, ISBN, modulo eleven and the two ISO 7064 rules, with the working digit by digit.

VAT number format validator
Every European Union country's format, and the national check digit wherever this tool actually has the algorithm.

ISBN 10 and 13 converter
Both forms of a book, journal and sheet-music numbers too — and it refuses the conversion that has no answer.

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