Turkish IBAN Validator

Checks whether the Turkish IBAN (starting with TR) you enter passes the standard MOD-97 check digit algorithm.

With Turkish IBAN Validator, you get the answer instantly instead of calculating or looking it up by hand. Turkish IBAN Validator brings a small but genuinely useful tool together on a single page. Everything runs in your browser — your file or text is never uploaded to a server.

Step-by-step

Paste the IBAN into the 'IBAN' field. Turkish IBANs start with TR and are 26 characters long in total.
If you copied it from a PDF or a message, make sure no extra spaces came along at the start or end.
Click 'Run'.
A valid result means the IBAN passes the MOD-97 check digit test. An invalid result means you should compare it character by character with the source.

When is it useful?

IBAN stands for International Bank Account Number, the standard format used for bank transfers in Türkiye and across Europe. The two digits after TR are check digits calculated from the rest of the number, so a single mistyped digit, or two neighboring digits swapped, is almost always caught. That makes this check handy when entering supplier IBANs into a spreadsheet, saving a tenant's or client's bank details, or testing the IBAN field on a web form you're building.

Example

A client reads their IBAN to you over the phone and you write it down. You paste your note here before setting up the payment and get an invalid result. You've caught the mistake before money left your account, and asking the client to send the IBAN in writing saves you from a transfer to the wrong account that can be slow and awkward to recover.

How is a Turkish IBAN validated?

A Turkish IBAN starts with TR and is 26 characters long (TR + 24 digits). After checking the format the tool computes the MOD-97 checksum: the country code and check digits at the start are moved to the end, letters are converted to numbers, and if the remainder of that large number divided by 97 is 1, the IBAN is valid. This catches most typing mistakes.

Practical tips

The tool fixes spaces and lowercase for you, but still make sure no stray characters sneak in when you copy an IBAN from the bank.
Validate before a large transfer; a wrong IBAN causes delivery problems.
This check only shows that the format is valid.

Common mistakes

Assuming a valid IBAN certainly belongs to the right person; the tool does not verify the account holder or that the account exists.
Confusing the digit 0 with the letter O.
Entering a foreign IBAN and expecting a Turkish result.

Things to keep in mind

A valid result does not prove the account exists or that it belongs to the person you expect. It only shows that the number is internally consistent.
Always compare the account holder name your bank shows on the payment screen with who you meant to pay.
Be wary of unexpected emails saying someone's bank details have changed. Confirm by calling a phone number you already had, not one in the email.
Treat IBAN lists as personal data and share them only with people who need them.