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Pwned Passwords: Secure Password Checking Service

2025-09-13

Cybersecurity professionals and individuals concerned about online security can now easily check if their passwords have been compromised in known data breaches using Pwned Passwords, a service provided by Have I Been Pwned. Pwned Passwords is a vast repository of previously breached passwords that are made freely available to help services block these passwords from being used again.

What is Pwned Passwords?

Pwned Passwords is a comprehensive corpus of passwords that have been exposed in data breaches. By checking a password against this list, users can determine if their password has been compromised and take appropriate action to secure their accounts.

Key Features

  • Password Checking: Users can check if their passwords have appeared in known data breaches.
  • API Access: The service provides an API for integrating Pwned Passwords into applications, enabling developers to prevent the use of vulnerable passwords.
  • Global Performance: Delivered through Cloudflare's global network, the service handles over 13 billion requests monthly with high availability and low latency.

Benefits

Pwned Passwords helps protect against credential stuffing and password reuse risks by identifying compromised passwords. It aligns with NIST guidelines recommending checks against previously breached datasets.

Usage

Users can directly check their passwords on the website or integrate the Pwned Passwords API into their applications for enhanced security. The service is supported by Cloudflare's infrastructure, ensuring reliability and performance.

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