Credit Card Generator
Generate valid test credit card numbers.
Generate valid test credit card numbers.
This free Credit Card Generator from KX Toolkit is part of our all-in-one online toolkit. It runs entirely in your browser, so your data never leaves your device for client-side operations. 100% free, forever - no paywall, no credit card, no trial.
How to use the Credit Card Generator
- Pick the algorithm or generation options.
- Enter your input (or click "Generate" for random output).
- Click the action button - the result appears instantly.
- Copy the result. Never paste sensitive secrets into the input again afterwards.
What you can do with the Credit Card Generator
- Generate strong passwords for new accounts.
- Hash data for verifying file integrity.
- Encode binary in Base64 for inline embedding.
- Test bcrypt or MD5 outputs while building auth systems.
Why use KX Toolkit's Credit Card Generator
- Browser-based: Works on Windows, macOS, Linux, iOS and Android - no install, no extension.
- Privacy-first: Client-side tools never upload your data; server-side tools delete files right after processing.
- Mobile-friendly: Full feature parity on phones and tablets - not a stripped-down view.
- Fast: Optimised for instant feedback. No artificial waiting screens, no email-gated downloads.
- One hub for everything: 300+ tools across SEO, text, image, PDF, code, color, calculators and more - skip switching between sites.
Tips for the best results
Always check the URL bar before pasting sensitive data - KX Toolkit's crypto tools run client-side, but you should still verify you're on the right domain.
Related Password & Encryption
If you find this tool useful, explore the full Password & Encryption collection or browse our complete tool directory. KX Toolkit is built for marketers, developers, designers, students and anyone who needs a quick utility without signing up for yet another SaaS.
Are these credit card numbers real?
No. The generator produces numbers that pass the Luhn checksum and use real issuer prefixes, so they look valid to client-side validators. They are not connected to any actual cardholder, account, or financial institution and cannot be used to make purchases. The numbers exist solely for testing payment forms, validating client-side regex, and seeding development databases without exposing real customer data.
Is it legal to use these numbers?
In test environments, yes. Using a fake card number to attempt a real charge - even one that fails - can violate payment processor terms and computer fraud laws in many jurisdictions. Always run real payment integration tests against your processor's designated sandbox numbers (Stripe, Braintree, Adyen, and others publish them) so the request flows through their test rails legitimately. This generator is for client-side and offline scenarios.
What is the Luhn algorithm and why does it matter?
The Luhn algorithm is a simple checksum that catches most single-digit typos and adjacent transpositions in card numbers. The last digit of every real card is computed so that summing the digits according to a specific rule yields a multiple of ten. Form validators run Luhn before sending the number anywhere, which is why generated test data must satisfy it - otherwise the form rejects the input before any test can proceed.
Why does the prefix differ between Visa, Mastercard, and Amex?
Issuers are assigned distinct number ranges by the ISO 7812 standard. Visa cards begin with 4, Mastercard with 51-55 or 2221-2720, American Express with 34 or 37, Discover typically with 6011 or 65, and so on. The length also varies - most cards are 16 digits, Amex is 15, and some Diners Club cards are 14. The generator uses these official ranges so the output passes brand-detection logic.
Can the generator produce CVV and expiration values too?
Yes, and these are also fake. The CVV is a random 3 or 4 digit number with no relationship to the card number, since real CVVs are computed from a secret key held by the issuer. The expiration is a future date so test forms accept it. None of these values can be used to authorize a real transaction - they exist only to satisfy local form validation.
Is anything I generate sent to your server?
No. The generator runs in your browser, picks a random prefix from the chosen brand, fills in the body, and computes the Luhn check digit locally. No values cross the network, get logged, or appear in analytics. Even though these are fake numbers we treat the data with the same care as real input, so refreshing for new values does not leave a trail on our side.
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