Prevent Pwned Passwords

Checks password hashes against Have I Been Pwned and displays a notification if the hash has been leaked in a breach.

Prevent Pwned Passwords - Chrome Extension

Prevent Pwned Passwords is a Chrome extension that checks password hashes against the Have I Been Pwned database. If your password has been compromised in a breach, you will receive an alert to change it. This extension enhances password security by preventing the use of passwords known to be part of data breaches.
Install from Chrome Web Store

Extension stats

Users: 127
-5
Rating: 5.00
(1)
Version: 1.1.0 (Last updated: 2017-10-28)
Creation date: 2017-10-28
Risk impact: Moderate risk impact
Risk likelihood:
Manifest version: 2
Permissions:
  • notifications
  • storage
  • contextMenus
Size: 27.36K

Other platforms

Not available on Android
Prevent Pwned Passwords (v1.0.1resigned1)
3.00 (3) 60
Not available on Edge
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Extension summary

Prevent Pwned Passwords helps make sure you don't use any password that's known to have been part of a data breach. If you try to use a password that's known to have been compromised, you'll get an alert.

You can choose to run it whenever you enter a password on any site, whenever you enter a password on a "Create Account" page, or only when you choose to check a password from a context menu. You can also whitelist sites, giving you greater control over what passwords are checked.

This extension hashes your password and securely checks that hash against a database of hashes known to be breached. If it's been involved in a past breach (of any account across hundreds of sites), it notifies you so you can change your password.

Note that the only data ever transmitted is a password hash. We never send a clear-text password or any identifiable information like a username or a URL.

This extension uses the Have I Been Pwned service.

Extension safety

Risk impact

Prevent Pwned Passwords requires a few sensitive permissions. Exercise caution before installing.

Risk likelihood

Prevent Pwned Passwords has earned a good reputation and can be trusted.

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