Password Leak Checker
Check if your passwords have been compromised in data breaches.
Check Password Security
Batch Password Checker
Check multiple passwords at once (each password on a new line)
🛡️ How Password Leak Checking Works
Have I Been Pwned API
We use the trusted Have I Been Pwned API to check passwords against billions of compromised credentials.
- Over 11 billion compromised accounts
- 600+ data breaches tracked
- Regular database updates
k-Anonymity Privacy
Your full password is never sent. Only the first 5 characters of the SHA-1 hash are transmitted.
- Password hashed locally
- Only hash prefix sent
- Complete privacy protection
Strength Analysis
Advanced password strength analysis checks length, complexity, and common patterns.
- Entropy calculation
- Dictionary word detection
- Pattern recognition
🔐 Password Security Best Practices
Use Unique Passwords
Never reuse passwords across multiple accounts. Each account should have its own unique password.
Enable 2FA
Two-factor authentication adds an extra layer of security even if your password is compromised.
Use a Password Manager
Password managers generate and store unique, strong passwords for all your accounts.
Regular Security Checks
Regularly check your passwords and update any that have been found in data breaches.
🔒 Your Privacy is Protected
- Passwords are hashed locally using SHA-1
- Only the first 5 characters of the hash are sent to the API
- Your actual password never leaves your browser
- No passwords are stored or logged by this tool
- All processing happens client-side