Password Breach Checker
Check if your password has been exposed in data breaches using secure k-anonymity
Your password is never sent to any server. We use k-anonymity with SHA-1 hash prefixes to securely check against breach databases.
How It Works
Hash Locally
Your password is hashed using SHA-1 entirely in your browser
Send Prefix Only
Only the first 5 characters of the hash are sent to the API
Local Comparison
We compare the full hash locally against returned suffixes
Secure Result
Your actual password is never transmitted or stored
Check Your Password Security
Enter a password above to check if it has been exposed in any known data breaches. Your password is never sent to any server.
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