Check if your password has been exposed
Private, secure, and instant breach detection using k-anonymity. The Sentinel’s Veil ensures your actual credentials never leave your machine.
Why check for pwned passwords?
Password reuse is extremely common and puts your accounts at risk. When credentials are exposed in data breaches, attackers can use these known email and password combinations to access your other accounts.
NIST guidelines specifically recommend checking user passwords against previously breached datasets. This service provides a simple, secure way to comply with these guidelines.
The dangers of password reuse
Credential Stuffing
Attackers automate login attempts using leaked credentials from other sites, exploiting password reuse habits.
Data Breaches
Large-scale breaches expose millions of passwords, which are often used across multiple services.
Password Patterns
Even when users modify passwords between sites, attackers can easily predict common patterns.
Reliable Service Performance
Globally Distributed Performance
Our password checking service handles over 18 billion requests monthly, delivered through Cloudflare's global network for high availability.
With a cache hit ratio over 99.9%, the service provides lightning-fast responses regardless of your location.
The service is delivered via 335 edge locations distributed across 125+ countries.
Technical Integrity
Our multi-layered security protocol ensures zero-knowledge verification.
Hashing Locally
Your password is immediately hashed using SHA-1 inside your browser. The raw text never touches our servers.
Partial k-Anonymity
We only send the first 5 characters of the hash. This prefix matches thousands of passwords, making identification impossible.
Cloud Comparison
Our engine retrieves all matching suffixes from the leak database and performs a client-side comparison for a final match.
The Sentinel’s Veil
Security is not just a feature; it's our architectural foundation. LeakShield employs enterprise-grade k-anonymity protocols to ensure that even in the process of protecting you, your privacy is never compromised.
ISO 27001 Compliant
Our data handling processes meet global security standards.
Open Source Verification
Our client-side hashing scripts are available for public audit.