How to Use the Pwned Checker
Enter a password and click Check. The tool uses the Have I Been Pwned API with k-anonymity to check if your password has appeared in known data breaches.
Check if your password has appeared in data breaches. Uses k-anonymity — your full password never leaves your browser.
Your password is SHA-1 hashed locally in your browser
Only the first 5 chars of the hash are sent to the API
The API returns all matching hashes; we check locally
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Enter a password and click Check. The tool uses the Have I Been Pwned API with k-anonymity to check if your password has appeared in known data breaches.
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