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Check if a password has leaked in a data breach — hashed locally, never sent in full.
Your password is hashed with SHA-1 in your browser. Only the first 5 characters of the hash are sent to the Have I Been Pwned API (k-anonymity) — the full password and full hash never leave your device.
Check whether a password has appeared in known data breaches, using the Have I Been Pwned Pwned Passwords database. Your password never leaves your browser — it is hashed with SHA-1 locally and only the first 5 characters of the hash are sent to the API (k-anonymity), so the full password and full hash are never transmitted.
Password Breach Checker allows you to quickly verify whether a password has appeared in known data breaches without ever transmitting your actual password. By using local SHA-1 hashing and k-anonymity (sending only the first 5 characters of the hash), it ensures your sensitive data remains entirely secure within your browser. It is a completely free, no-signup tool leveraging the Have I Been Pwned Pwned Passwords database for instant privacy verification.
Good to know: This tool checks individual passwords against known breach databases but does not evaluate complex structural password strength or generate new secure credentials on its own.
Securely verify if your password has been exposed in a data breach without ever revealing your full password or hash.
Access the Password Breach Checker tool
Navigate to the Password Breach Checker page to begin your security audit. The tool loads locally in your browser to ensure maximum privacy.
Enter the password you want to check
Type or paste the password into the secure input field. Your password is immediately hashed with SHA-1 locally on your device.
Initiate the secure k-anonymity check
Click the check button to send only the first five characters of the hash to the Pwned Passwords database. This method ensures your full password and full hash are never transmitted.
Review the breach status results
Check the results to see if your password appeared in known data leaks. If a match is found, consider changing that password across all your accounts immediately.
Estimated time: PT1M
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