Bank Account Number Checker
Validate IBANs, SWIFT/BIC codes, US routing numbers, and country-specific bank account formats.
Validate bank account formats
Disclaimer. This tool validates formatting and structure only. It does not verify ownership, account existence, balances, or banking relationships. Always confirm payment details directly with the recipient or their bank before sending money.
About Bank Account Number Checker
Bank Account Number Checker is a free, browser-based validator for the most common bank identifiers. Check IBANs against country length tables and the mod-97 check digit, validate SWIFT/BIC structure and decode the bank, country, location, and branch codes, verify US ABA routing numbers with the official checksum, and sanity-check bank account number lengths across nine countries. All processing happens locally — nothing is uploaded.
Frequently asked questions
Learn more
What Is Bank Account Validation?
Why checking the format of an account number, IBAN, or routing number catches errors before money moves.
Read articleUnderstanding IBAN Numbers
Country code, check digits, BBAN — how an IBAN is built and how the mod-97 check works.
Read articleUnderstanding SWIFT / BIC Codes
What the 8 or 11 characters of a SWIFT/BIC really mean, and when you need one.
Read articleIBAN vs SWIFT: What's the Difference?
One identifies the account, the other identifies the bank — and you often need both.
Read articleCommon Bank Account Entry Errors
Transposed digits, mixed-up codes, copy-paste whitespace — the typos that cost the most.
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