Leaked Passwords
Check if your password has appeared in known data breaches
Why check for leaked 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 check if your password has been compromised.
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, often shared across multiple services.
Password Patterns
Even when users modify passwords between sites, attackers can easily predict common patterns.
đĄī¸ Reliable Service Performance
Monthly Requests
Cache Hit Ratio
Edge Locations
âšī¸ API & Integration
API Access
Integrate Leaked Passwords checks into your own applications with our API. Prevent users from selecting vulnerable passwords and improve your security posture.
View API Documentation âDownload & Integrate
The best way to get the most up-to-date password list is via the API. Alternatively, use the free and open source downloader to take the entire corpus offline and run it yourself.
Access on GitHub ââšī¸ Partners
Powered by Cloudflare
This service is made possible by Cloudflare's generous support. They provide the global infrastructure to serve billions of requests securely and efficiently.
Password Management
Use a password manager to generate and store strong, unique passwords for all your accounts. 1Password helps protect your data with industry-leading security.
đ Support This Service
Leaked Data Checker is a free resource for the entire community. If you find this service valuable, please consider supporting it with a donation.