Credit Card Number Validator

Check a card number with the Luhn algorithm, detect the network (Visa, Mastercard, Amex, Discover, JCB, UnionPay…) and validate its length. Nothing is sent.

Card number

Spaces and hyphens are ignored.

Result	Valid number (passes Luhn and length rules)
Card network	Visa
Luhn checksum	Passed
Length	16 digits (allowed: 13, 16, 19)
Length allowed for this network	Yes
Formatted	4111 1111 1111 1111
Security code length	3

Everything is calculated in your browser; the number is never sent anywhere. A valid result only means the number is well-formed – it does not mean the card exists, is active or has funds. Use official test numbers (e.g. 4111 1111 1111 1111) for development.

What is Credit Card Validator?

This validator checks whether a payment card number is well-formed: it runs the Luhn checksum, identifies the card network from the issuer range (IIN/BIN), verifies the length is allowed for that network and formats the number in the network's usual grouping. Everything runs in your browser.

How to use Credit Card Validator

Type or paste a card number; spaces and hyphens are ignored.
Read the result: overall verdict, card network, Luhn checksum, length and whether it is allowed.
Use the formatted number and the security code length as needed for test data.

Example

Input

378282246310005

Output

American Express · Luhn passed · 15 digits (allowed: 15) · formatted 3782 822463 10005 · security code length 4

When to use Credit Card Validator

Use it to test checkout forms, generate correct-looking test data or catch typos before submitting a number. A valid result does not mean the card exists, is active or has funds – only the issuer can confirm that through a payment authorization. Never paste real card numbers into tools you do not trust.

How Credit Card Validator works

The Luhn algorithm doubles every second digit from the right, subtracts 9 from results above 9 and checks that the total is divisible by 10. The network is detected from known IIN ranges, checked from most to least specific: Amex 34/37, Diners 300–305/36/38/39, JCB 3528–3589, Mir 2200–2204, Mastercard 51–55 and 2221–2720, Discover 6011/644–649/65, UnionPay 62/81, Visa 4, Maestro 50/56–69. Grouping follows each network (Amex 4-6-5, others 4-4-4-4).

Common Use Cases

Verify that official test numbers such as 4111 1111 1111 1111 pass your form's validation.
Show the right card logo in a checkout form as the user types.
Catch a mistyped digit before a payment API call.
Teach or demonstrate how the Luhn checksum works.

Security Note

Use test card numbers for development. The tool does not store or transmit what you type, but avoid entering real cards on any website other than the merchant's checkout.