The toolbox · Security
Has your password been leaked?
Paste any password and find out in a click whether it has turned up in a known data breach — and how badly. We check it against billions of leaked credentials.
- Your password never leaves in the clear. Only a short, irreversible fingerprint of it is checked (k-anonymity).
- Nothing is stored. We don't save, log, or remember what you type — the check runs and it's gone.
- Free, and no sign-up. Check as many passwords as you like.
Check a password
We'll tell you if it's safe to use.
k-anonymity, explained
Your password is hashed, and only the first five characters of that hash are sent. The breach database returns thousands of possible matches — and the final comparison happens here, on our server. Your password can't be reconstructed from what leaves it.
Nothing is stored
We don't save, log, or remember the password you type. The field isn't even re-filled after you check — the result appears, and what you typed is gone.
Powered by real breach data
We check against the Have I Been Pwned corpus — billions of real passwords exposed in public data breaches. If yours is in there, attackers already have it too.
If yours came back risky
Build one that won't
A strong password is long, unique, and unguessable. You don't need to memorise gibberish — a few random words beats a clever substitution every time.
Generate a strong password-
1
Go long. Aim for 16+ characters — length beats complexity. A passphrase of four random words is easy to recall and very hard to crack.
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2
Make it unique. Never reuse a password across sites — one breach then unlocks everything. This checker only tells you about known leaks.
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3
Mix it up. Blend upper- and lower-case letters, a number and a symbol — but only on top of length, not instead of it.
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4
Let a manager remember. Use a password manager to generate and store a different strong password for every account — and turn on two-factor authentication.
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