So nutzt du: Password Breach Checker
- Type or paste the password you want to check. It stays in this page.
- Click Check. Your browser computes the SHA-1 hash and sends only its first 5 characters to Have I Been Pwned.
- The service returns every leaked hash with that prefix; your browser looks for a full match locally.
- If it was found, stop using that password everywhere and switch to a unique one from a password manager.
How it checks without sending your password
This uses the k-anonymity model of Have I Been Pwned’s Pwned Passwords service. Your browser hashes the password with SHA-1 (for example 5BAA6… for “password”) and requests /range/5BAA6. The service answers with all ~800 leaked hashes that start with those 5 characters, and the browser checks for yours. Nobody — not devpack, not the service — learns your password or even its full hash. Requests are padded so the response size reveals nothing.
What the result means
- Found: the password is in breach lists that attackers use for “credential stuffing”. Change it on every site where you used it, even if it looks strong.
- Not found: it isn’t in known breaches. That doesn’t make it strong — short or guessable passwords can still be cracked. Check it with the Password Strength Checker.
Good password habits
Use a different password for every site (a password manager makes this easy), turn on two-factor authentication, and generate long random passwords with the Password Generator.
Data: Pwned Passwords by Troy Hunt, CC BY 4.0.
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