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🏦 Routing Number Checker

Validate US bank routing numbers (ABA numbers) instantly. Check digit length, verify checksum, and detect common errors.

Routing Number Checker

Validate a US bank routing number (ABA). Must be exactly 9 digits and pass the checksum test.

How to use this tool

Enter the routing number exactly as it appears on the check or account paperwork (hyphens and spaces are ignored).
Press "Check" to run the ABA modulus-10 checksum that banks use to validate routing numbers.
Review the status badge to confirm whether the number is structurally valid before using it in transfers or onboarding forms.

Where it helps

Clean up routing numbers collected from paper forms before importing into payroll systems.
Validate sample data used in staging environments so test payments fail gracefully.
Quickly double-check numbers read aloud over the phone without logging into online banking.

Troubleshooting

Routing numbers are always 9 digits—Canadian or international identifiers use different formats.
If the checksum fails, confirm the number wasn't transposed or truncated during data entry.
Use the ABA lookup from your bank when opening new accounts to ensure you have the correct number for ACH vs. wires.

FAQ

Does a valid checksum guarantee the routing number is active?: No. The checksum only proves the number is formatted correctly. Contact the bank or use the ABA directory to ensure the institution is active.
Why do some banks list multiple routing numbers?: Institutions often publish different numbers for ACH, wire transfers, or region-specific processing. Always match the number to the transaction type.
Can I use this for IBAN or SWIFT validation?: No. IBAN and SWIFT/BIC identifiers follow separate standards—use the dedicated validators in this toolbox for international accounts.

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