💳 Credit Card Validator

💳 Credit Card Number Input

Supports various formats: spaces, dashes, or no separators

🧪 Test Card Numbers

These are test numbers for development - never use real card numbers!
4111 1111 1111 1111
Visa Test Card
5555 5555 5555 4444
Mastercard Test Card
3782 8224 6310 005
American Express Test Card
6011 1111 1111 1117
Discover Test Card

🧮 Luhn Algorithm

Step 1: Start from rightmost digit (excluding check digit)
Step 2: Double every second digit from right
Step 3: If doubled digit > 9, subtract 9
Step 4: Sum all digits
Step 5: If sum is divisible by 10, number is valid
Used by: Credit cards, IMEI numbers, bank routing numbers

⚠️ Security Notice

Development Only: Use test card numbers only
Never Enter Real Cards: This tool is educational/testing only
PCI Compliance: Real card data requires secure handling
Validation ≠ Valid Card: Luhn valid doesn't mean active card

✅ Validation Results

Original Input:
{{ result.input }}
Cleaned: {{ result.cleaned }}
✅ ❌ Overall Valid
{{ result.valid ?'All checks pass' :'Validation failed' }}
✅ ❌ Luhn Valid
{{ result.luhn_valid ?'Checksum correct' :'Checksum invalid' }}
⚠️ Warnings:
  • {{ warning }}

💳 Card Information

{{ getCardIcon(result.card_type) }}
{{ result.card_type }}
{{ result.issuer }}
Formatted Number:
{{ result.formatted }}
Length: {{ result.length }} digits
IIN: {{ result.cleaned.substring(0, 6) }}

🔬 Card Analysis

Network: {{ result.analysis.network }}
Category: {{ result.analysis.category }}
Region: {{ result.analysis.region }}

🔒 Security Features

{{ feature.name }}
{{ feature.description }}
✅ ❌
Value: {{ feature.value }}
Location: {{ feature.location }}

⚡ Actions

⚠️ {{ error }}

ℹ️ About Credit Card Validator

Credit Card Validator checks payment-card style Primary Account Numbers (PANs) by normalizing spaces or dashes, identifying common issuer patterns, and running the Luhn algorithm. Luhn, also called "modulus 10", is a check-digit formula designed to catch common transcription mistakes before a number is sent to a payment gateway.

Use it to test checkout form validation, verify processor-provided test card numbers, debug payment gateway integrations, or demonstrate how card check digits work. A passing result means the number has a valid format and checksum; it does not mean the card exists, is active, has funds, or is authorized for a transaction.

How validation works:

  • Removes spaces and hyphens so formatted and unformatted inputs are treated the same.
  • Checks the length and leading digits against common Visa, Mastercard, American Express, Discover, JCB, Diners Club, and UnionPay patterns.
  • Calculates the Luhn check digit and compares it with the final digit of the input.
  • Reports issuer hints from the Issuer Identification Number (IIN), also commonly called a BIN.

Practical examples:

  • 4111 1111 1111 1111 is a common Visa test number and passes the Luhn checksum.
  • 5555 5555 5555 4444 is a common Mastercard test number and passes the Luhn checksum.
  • Changing the last digit of either example should fail the checksum while leaving the visible format unchanged.

Supported card-type hints:

  • Visa: 13, 16, or 19 digits starting with 4
  • Mastercard: 16 digits starting with 5 (51-55) or 2 (2221-2720)
  • American Express: 15 digits starting with 34 or 37
  • Discover: 16 digits starting with 6011 or 65
  • JCB: 16 digits starting with 3528-3589
  • Diners Club: 14 digits starting with 30, 36, 38
  • UnionPay: 16-19 digits starting with 62

Card numbering is defined around the PAN and IIN concepts in ISO/IEC 7812-1. In the United States, the American Bankers Association IIN page documents the ISO/IEC 7812 registration authority role. The Luhn check-digit method comes from Hans Peter Luhn's US Patent 2,950,048.

Limitations and security: IIN ranges can change, and this tool is not a replacement for processor authorization, tokenization, CVV/CID checks, address verification, fraud screening, or PCI-scoped payment handling. Do not enter real card numbers for testing. Use test numbers from your payment processor, and avoid storing PANs unless there is a documented business need and the data is protected according to PCI SSC data-storage guidance.

API Usage Example:

POST /api/tools/osint/credit-card-validator
Content-Type: application/json

{
    "card_number": "4111 1111 1111 1111"
}
Ready