Check if Your Password Has Been Compromised in Data Breaches
Our password leak checker helps you verify if your password has been compromised in known data breaches by cross-referencing it against the comprehensive Have I Been Pwned (HIBP) database. This free online tool checks billions of passwords that have been exposed in major security breaches, helping you identify vulnerable credentials before attackers can exploit them. The checker uses the k-anonymity model to ensure your actual password never leaves your device, making it one of the most secure methods to verify password safety.
How Password Leak Detection Works: When you check a password, our tool creates a SHA-1 hash of your input and sends only the first 5 characters to the Have I Been Pwned API. The API returns all matching hash prefixes, and your browser performs the final comparison locally. This k-anonymity approach means your actual password is never transmitted over the internet, protecting your privacy while still allowing accurate breach detection across hundreds of millions of compromised passwords.
Why Check for Password Breaches: Data breaches expose billions of passwords annually. Attackers use these leaked credentials in credential stuffing attacks, attempting to access accounts across multiple services. If your password appears in breach databases, it's crucial to change it immediately - even if it seems strong. Our password security checker provides real-time analysis of both breach exposure and password strength, helping you make informed decisions about your account security.
Features: Privacy-first breach checking using k-anonymity protocol • Real-time password strength analysis with zxcvbn algorithm • Crack time estimation for offline attacks • Detailed security feedback and improvement suggestions • Zero data storage or logging • Integration with Have I Been Pwned database containing 850+ million compromised passwords • Instant results with no registration required • Works entirely in your browser for maximum security
Best Practices for Password Security: Use unique passwords for every account, enable two-factor authentication (2FA) wherever possible, and avoid common password patterns. A password manager can help generate and store complex, unique passwords. Regularly check your passwords against breach databases, especially for critical accounts like email, banking, and work systems. If this tool indicates your password has been compromised, change it immediately across all accounts where you've used it.
About Have I Been Pwned: Have I Been Pwned is a trusted security service created by security researcher Troy Hunt. It aggregates data from hundreds of confirmed data breaches to help users determine if their credentials have been compromised. The database is continuously updated with newly discovered breaches and is widely recognized as the authoritative source for breach verification by security professionals and organizations worldwide.