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Luhnly
Fake credit card numbers that actually pass validation
Luhnly generates fake credit card numbers that pass the Luhn checksum — the same formula real issuers use — for Visa, Mastercard, Amex, and Discover. Built for developers and QA engineers testing checkout flows without touching a live gateway. Runs entirely in your browser — no signup, nothing stored. Includes free testing guides for Stripe, PayPal, Square, Braintree, and Authorize.net, since every processor handles test cards differently. Free, no account wall.
Hey Product Hunt 👋
Built Luhnly after noticing most "credit card generator" tools online are either cluttered with ads, feel sketchy to use, or don't make it obvious who built them or why. Wanted something that just does the one thing well: generates Luhn-valid test numbers, explains the math, and gets out of your way.
A few things worth knowing:
Every number is genuinely Luhn-valid — actually found and fixed a bug in my own checksum logic before launch, which felt important to mention given correctness is the entire point of the tool
Runs 100% in your browser, nothing stored or tracked beyond basic analytics
Free guides for Stripe, PayPal, Square, Braintree, and Authorize.net sandbox testing, since they all behave differently in ways that aren't obvious the first time (PayPal accepts any Luhn-valid number; the other four require their own specific reserved cards — that tripped me up before I built this)
Would love feedback, especially from anyone who tests payment integrations regularly — what's missing, what's annoying, what you'd want next.
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About Luhnly on Product Hunt
“Fake credit card numbers that actually pass validation”
Luhnly was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #120 on the daily leaderboard. Luhnly generates fake credit card numbers that pass the Luhn checksum — the same formula real issuers use — for Visa, Mastercard, Amex, and Discover. Built for developers and QA engineers testing checkout flows without touching a live gateway. Runs entirely in your browser — no signup, nothing stored. Includes free testing guides for Stripe, PayPal, Square, Braintree, and Authorize.net, since every processor handles test cards differently. Free, no account wall.
Luhnly was featured in API (98.6k followers) and Developer Tools (519k followers) on Product Hunt. Together, these topics include over 94.5k products, making this a competitive space to launch in.
Who hunted Luhnly?
Luhnly was hunted by Pixoware. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
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