信用卡号校验
Luhn 算法校验卡号
🔒 100% client-side — your data never leaves this pageCard Number Input
Validation Result
Validation result will appear here
🔒 100% client-side
About this tool
通过 Luhn 算法快速校验信用卡号是否满足基本校验规则，并识别常见卡组织模式（如 Visa、Mastercard、Amex、Discover）。适合支付表单联调、测试数据检查和输入规则验证。工具仅做格式与校验位判断，不涉及真实交易能力。
Frequently Asked Questions
What does Luhn validation verify?
It verifies whether the number satisfies a checksum rule used by most payment card systems.
Is a Luhn-valid card guaranteed to be real?
No. It may still be expired, blocked, or non-existent. Luhn checks only structural validity.
Can I validate multiple card numbers at once?
Yes. Paste one number per line and the validator checks each independently.