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IBAN checker

An IBAN carries its own proof of transcription: two check digits computed from the whole number, so a single mistyped character makes the arithmetic fail. Paste an IBAN from a statement or an invoice and this tool runs the ISO 13616 checksum, verifies the country's length, and for UK IBANs decodes the sort code and account number inside.

Runs in this browser tab. Nothing you paste or open here is uploaded.

Spaces and letter case do not matter; the checker normalises both.

Limitations

  • A passing checksum means the number is well formed, not that the account exists, is open, or belongs to the person who gave it to you. Confirm payee details through a second channel before paying anyone.
  • Country lengths are checked against the SWIFT IBAN Registry for common countries; rarer countries get the checksum check only.
  • Only UK (GB) IBANs are decoded into sort code and account number; other national formats differ and are left whole.

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