Luhn check

validate card/IMEI numbers + generate the check digit — for test data

Validate number

Number (spaces/dashes ok)

Check digit is correct

type: Visa • 16 digits

Append check digit

Number body (without last digit)

Full number

3569380356438096

check digit: 6

The Luhn algorithm (ISO/IEC 7812) catches single typos and most adjacent-digit transpositions, but does NOT prove the card exists. Test numbers for payment systems (e.g. 4111 1111 1111 1111 — Stripe test Visa) pass Luhn. For IMEI the check digit is the 15th.

About Luhn

Luhn — free online tool on usefulhub.cloud. IT Tools: Developer utilities. Use our tools without registration or installing software. All calculations happen in your browser — your data is never sent to a server.