Download software tagged by checkdigit

Helps you proofread, interconvert, validate and tidy ISBN-10 and ISBN-13 (International Standard Book Number) references in your HTML or other documentation. It validates the checkdigit, inserts dashes, interconverts ISBN-10 and ISBN-13.

The CreditCard Validator will help you tell: (1) if a credit card number is valid (2) which credit card vendor handles that number. It validates the prefix and the checkdigit. It does *not* contact the credit card company.

The CreditCard Validator will help you tell: (1) if a credit card number is valid (2) which credit card vendor handles that number. It validates the prefix and the checkdigit. It does *not* contact the credit card company.