Credit Card Validator
Check whether a card number is structurally valid — Luhn checksum and length — entirely in your browser. It never verifies live cards.
- Instant results
- Nothing stored
- Runs in your browser
Instant results
Answers appear the moment you enter a number — no accounts, no setup, nothing to wait for.
Private by design
We never ask for or store a full card number — your sensitive details stay with you.
Free, no sign-up
Every tool is completely free to use — no account, no limits, no catch.
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What “valid” means here
This tool runs three independent structural checks and reports each one:
- Digits only — the input contains valid characters.
- Length for network — the number is a plausible length for its detected network (for example, Visa is 13, 16, or 19 digits; Amex is 15).
- Luhn checksum — the number passes the mod-10 check digit test.
Why a valid card can still be declined
Structural validity is necessary but not sufficient. A number that passes every check above may still not correspond to a real, active card — and real cards are declined for insufficient funds, expiry, fraud checks and more. This tool cannot and does not verify that any card exists, is active, or can be charged.
How validation works
All processing happens locally. The full number stays in your browser’s memory, is masked by default in the result, and is never stored, logged, or transmitted. You can verify this yourself — open your browser’s network tab and watch: validating makes no requests.
Frequently asked questions
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