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utility / Privacy

Password Leak Checker

Check if a password has appeared in data breaches using the HaveIBeenPwned k-anonymity API.

Runs locally
LOCAL WORKBENCH
Input stays in this browser
k-Anonymity Password Leak Checker
100% Local (Password never leaves browser)

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Related utilities

01
Hash GeneratorGenerate MD5, SHA-1, SHA-256, SHA-384, SHA-512 hashes from text.
→02
Password GeneratorGenerate cryptographically secure passwords with configurable rules.
→03
Password Strength TesterAnalyze password entropy, crack time estimates, and pattern detection.
→

Field notes

Before you use it

Is my password sent to the server?+

No. We hash your password with SHA-1, send only the first 5 characters of the hash to the HIBP API, and check the response locally. Your password never leaves your browser.