Luhn Checksum Validator and Check Digit Generator
Verify the Luhn checksum of the decimal number line by line, or calculate the last digit for the number without the check digit.
Luhn Checksum Validator and Check Digit Generator User manual
- Fill in the parameters or select the file according to the form, and check the unit and format first.
- Example 79927398713 passes the verification; the base number 7992739871 is complemented by 3.
- Click the processing button to view the results, you can copy or download and save.
Calculation method and processing rules
Moving from right to left, double alternating digits and subtract 9 from doubled values above 9. Validate the sum modulo 10 or derive the final check digit.
scope of use
Up to 500 lines, 2 to 64 digits per line (1 to 63 digits for the supplementary bit); keep the leading zeros, and the verification pass does not mean that the account number exists, belongs or can be traded.
Will the input content be saved on the server?
This tool handles input in the browser, and does not upload files or form content. Typing practice scores are only saved in the native browser.
Why may the result be different from other tools?
Up to 500 lines, 2 to 64 digits per line (1 to 63 digits for the supplementary bit); keep the leading zeros, and the verification pass does not mean that the account number exists, belongs or can be traded. Please compare the input unit, rounding method, applicable rules and data version first.