Password Breach Check
ReadyCheck safely whether your password appears in known breaches.
All tools are free to use. File size and processing limits may vary by tool.
How to check safely?
Type your password; its SHA-1 hash is computed and only the first 5 characters are sent to the server. If a match is found, change it everywhere immediately.
Browser tools keep files on your device. Advanced document tools upload files for temporary server processing; the tool shows this before upload. Web lookups send queries to the server and public lookup services.
Password Breach Check: Safe Query Guide
A previously leaked password puts accounts at risk. This tool uses k-anonymity: only the first 5 hash characters leave the device, never the full password. On a match, change it everywhere immediately.
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