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IBAN Validator

MOD-97 checksum verification for international bank accounts

Examples:

What is IBAN

  • IBAN (International Bank Account Number) is an ISO 13616 standard format for bank accounts, used for cross-border SEPA and international wire transfers
  • Length varies by country: 15 chars (Norway) to 34 chars max
  • Structure: CC (2-letter country) + NN (2-digit checksum) + BBAN (country-specific bank+account)
  • The MOD-97 algorithm: move first 4 chars to end, convert letters to digits (A=10, B=11,..., Z=35), the resulting big number mod 97 should equal 1

Country code length reference

  • 15: NO • 16: BE • 18: DK, FO, FI, GL, NL, SD • 20: AT, LV, LU, BG, CY, EE, ME, MK • 22: HR, LT, MT, GE, BA • 24: DE, GR, IE, IT • 27: IT, FR, MC, MR, MT • 28: AZ, BH • 29: KW • 32: LC, MT

User Reviews

Average 4.9 stars based on 8 user reviews.

Emily Lin2026-05-11
Role: Risk Analyst

When I need free online iban validator, I care about fewer steps. IBAN Validator keeps MOD-97 checksum direct; with country code detection, follow-up review is easier for visitors coming from search.

Tina Guo2026-02-16
Role: E-commerce Operator

I found IBAN Validator while looking for iban validator without upload, and the real issue was that signup, payment, and form flows need bad data filtered first. Country code detection and format breakdown are on the same page, so I can validate the input format and collect problem items without stitching several tools together.

David Zhang2026-05-21
Role: Data Entry Specialist

For iban validator work, the important part is whether the output is easy to verify. IBAN Validator puts format breakdown up front, it catches format issues before real submission, and it handles iban checker work without sending me to another page.

Kevin Wang2026-02-26
Role: Operations Specialist

Our team runs into this during signup or payment flow troubleshooting: checking a list one item at a time is slow. IBAN Validator keeps the iban validator flow short, and clear format feedback helps with pre-handoff review for repeated Operations Specialist work.

Ryan Liu2026-05-05
Role: Support Lead

I needed iban validator that could validate the input format and collect problem items, not just a generic page. IBAN Validator keeps clear format feedback and batch-friendly input close to the real workflow, and the result is easy to copy into sheets, tickets, or cleanup workflows.

Steven Sun2026-02-10
Role: QA Engineer

For people searching iban validator without upload, this page matches the intent well. It is not a generic utility; IBAN Validator is built around iban checker; the output is easy to hand to engineering or operations, and the result is easy to keep working with.

Henry He2026-05-15
Role: Backend Engineer

During support or operations data review, IBAN Validator solves the part I worry about most: checking a list one item at a time is slow. By keeping free online IBAN (International Bank Account Number) validator visible in the workflow, there is less manual cleanup, and it reduces back-and-forth between operations, support, and engineering, so it belongs in my regular tool list.

Nathan Ma2026-02-20
Role: Product Manager

I would recommend IBAN Validator to anyone who needs iban validator. It covers long-tail needs like iban validator for iban checker naturally, and features such as MOD-97 checksum make the result easier to check than an ad hoc workaround.