Credit Card Validator
Validate any credit card number using the Luhn algorithm. Detects Visa, Mastercard, Amex, Discover, JCB, Diners Club, UnionPay and Maestro. Never sends card data anywhere.
✅ Luhn Check 💳 8 Networks 🔒 100% Private ⚡ Live
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Credit Card ValidatorTest numbers: Visa 4111111111111111 · MC 5500005555555559 · Amex 371449635398431 · Discover 6011111111111117
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100% Private
Card numbers are never sent to any server. Validation runs entirely in your browser.
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8 Card Networks
Detects Visa, Mastercard, Amex, Discover, JCB, Diners, UnionPay and Maestro.
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Luhn Algorithm
Industry-standard Luhn mod-10 check catches typos and invalid numbers.
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Live Validation
Results update with every keystroke — instant feedback as you type.
⭐ User Reviews
A
Alex T.
Yesterday
⭐⭐⭐⭐⭐
Exactly what I needed — fast, accurate and no sign-up required. Bookmarked for daily use.
Validator ToolsS
Sara K.
2 days ago
⭐⭐⭐⭐⭐
The detailed breakdown is excellent. Tells me not just pass/fail but exactly why. Very useful.
Validator ToolsD
Dan M.
1 week ago
⭐⭐⭐⭐⭐
Clean and reliable. I use this in my development workflow every day. Highly recommend.
Validator ToolsL
Laura B.
2 weeks ago
⭐⭐⭐⭐⭐
Saved me hours. The output is professional and ready to use without any editing needed.
Validator Tools📖 How to Use
1
Enter card number
Type or paste a card number — spaces and dashes are auto-formatted.
2
Network detected
The card network badge appears as you type.
3
Read checks
Each validation step shown with pass/fail status.
4
Use test numbers
Try the sample numbers shown below the input for testing.
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❓ FAQ
What is the Luhn algorithm?+
The Luhn algorithm (mod-10) is a checksum formula used to validate credit card numbers. It works by doubling every second digit from right to left, summing all digits, and checking the total is divisible by 10. It catches single-digit errors and most transpositions.
Does this tool check if a card is active?+
No. This tool only validates the format and Luhn checksum of a card number. It cannot check if a card is active, not expired, or has sufficient funds — that requires connecting to the card network, which is only possible during actual payment processing.
Is it safe to enter my card number here?+
Yes. The validator runs entirely in your browser using JavaScript. No data is sent to any server. You can verify this by disconnecting from the internet and the tool will still work. Never enter real card details on untrusted sites.
What are good test card numbers?+
Visa: 4111111111111111, 4242424242424242. Mastercard: 5500005555555559, 5105105105105100. Amex: 371449635398431. Discover: 6011111111111117. These are publicly published test numbers that pass Luhn but are not real cards.
Why does the card type matter?+
Different card networks have different valid number ranges (IINs/BINs) and lengths. Visa starts with 4 and has 13 or 16 digits. Amex starts with 34 or 37 and has 15 digits. Detecting the network helps validate the expected length.