Local · Private · Free

Test Card Number Generator

Generate Luhn-valid test card numbers with correct brand prefixes and lengths for payment-form testing, plus a validator that checks any number. All local, all free.

Brand

Length

Formatting

How many5

Future expiry (MM/YY) CVV (3 digits, 4 for Amex) Fake holder name

Generated entirely in your browser, nothing is sent anywhere or stored.

Paste card number(s), one per line Checked locally with the Luhn algorithm, numbers never leave your browser.

Why do these numbers “work” in test forms?

Card forms usually validate three things before talking to a bank: the brand prefix (IIN, e.g. Visa starts with 4, Amex with 34/37), the length (15 for Amex, 14 for Diners, 16 for most), and the Luhn checksum, a mod-10 digit invented in 1954 to catch typos. This tool generates numbers that satisfy all three, which is why sandboxes and front-end validators accept them. A real charge still requires an issuing bank to recognize the account, which these numbers don't have. Free forever, runs offline.

About Test Card Number Generator

Test Card Number Generator is a free, private browser tool by Digital Heroes. It generates Luhn-valid card numbers for Visa, Mastercard, Amex, Discover, JCB, and Diners Club, complete with optional CVV and future expiry. Because everything runs locally on your device, nothing is uploaded to a server. No sign-up or installation required. Works offline once loaded.

What you can do

Generate test card numbers for 6 major card brands with correct IIN prefixes and lengths.

Choose your format: spaces, dashes, or unformatted, with 1 to 100 numbers at once.

Include CVV and expiry alongside each number for complete test-data sets.

Add fake holder names to populate all fields in a payment form.

Validate any card number against the Luhn algorithm and detect the brand automatically.

Export results as CSV or JSON for use in test suites, fixtures, or CI pipelines.

How to use Test Card Number Generator

Open Test Card Number Generator in your browser. No signup needed.

Pick a card brand, digit length, and formatting style from the dropdowns.

Check the boxes for expiry, CVV, and holder name if you need them.

Set the count slider and click Generate. Numbers appear instantly.

Copy individual numbers, copy all at once, or download as CSV or JSON.

Switch to the Validate tab to check any card number against Luhn and detect its brand.

Frequently asked questions

Is Test Card Number Generator free?

Yes, Test Card Number Generator is completely free for everyone. No sign-up, no account and no usage limits.

Is it private? Are my files uploaded anywhere?

No. Test Card Number Generator runs entirely in your browser on your own device, so your data never leaves your computer and nothing is uploaded to a server.

Does it work offline?

Yes. This tool is a Progressive Web App, once the page has loaded it keeps working offline, and you can install it as an app from your browser.

Do I need to install anything or create an account?

No. Just open the page and start using it. Installing it as an app is optional and only adds offline convenience.

What does Test Card Number Generator do?

Generate Luhn-valid test card numbers, CVV & expiry for QA/testing, not real cards.