LeakCheck

LeakCheck compares your passwords and email addresses to millions of known data leaks – right on your PC.

Check Passwords. Monitor Accounts. Stay Safe.

• LeakCheck makes protecting your digital identity easier than ever.
• Secure checking via k-anonymity
• Matching against millions of known data breaches
• Add passwords easily via list
• Encrypted matching without plain text transmission
• Instant display of compromised entries
• Check email addresses for data breaches
• Detailed information on every data breach
• Add email addresses to the monitoring list
• View name, title, and date of each breach
• Automatic monitoring in the Professional Edition

Securely check passwords – thanks to k-anonymity A special feature: the secure k-anonymity check method. Your passwords are never transmitted in plain text – instead, only an anonymized hash fragment is sent to the Have I Been Pwned API. This ensures reliable results without compromising your security. Whether simple or complex passwords – LeakCheck checks all entries quickly and reliably against millions of known data breaches.

Check email addresses for data breaches – simple and clear With LeakCheck, simply add your email addresses to the monitoring list and check them against the Have I Been Pwned database with a single click. For each affected address, you instantly see which data breaches it has appeared in – including the name, title, and date of each breach. This keeps you fully informed about all risks and allows you to respond quickly and effectively.

Dashboard – all security information at a glance The clear dashboard of LeakCheck gives you an instant overview of the security status of your passwords and accounts. Safe and compromised entries are displayed separately – including the total number of detected data breaches. This allows you to immediately see where action is needed and set priorities accordingly.

Local data storage – securely encrypted on your PC All data stored in LeakCheck – passwords and email addresses – is saved exclusively on your local PC. To protect against unauthorized access, LeakCheck uses the Windows Data Protection API (DPAPI), which encrypts your data with a key tied to your Windows user account. This keeps your sensitive data protected even if someone else gains access to your PC.