◇Free
Luhn checksum checker
Validate a numeric identifier checksum without identifying an account.
Validate a numeric identifier checksum without identifying an account. Check a digit string by alternating doubled digits and evaluating its checksum modulo ten. Spaces and hyphens are removed before the validity and digit count are returned.
How to use
- Enter your text, values, or image.
- Adjust the options and run the tool.
- Copy or download your result.
Worked example
Example input
Input: 79927398713
Example result
{
"valid": true,
"digits": 11
}Limitations and details
Accepts 2–100 digits and checks only the checksum; passing does not establish an account, issuer or usable payment credential.
Inputs and options
- Input
- Text
Frequently asked questions
Is this tool free and private?
Yes. All 300 tools are free in this phase. Processing happens in your browser; your input and files are not sent to our servers.