Prevent Pwned Passwords

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

Extension stats

Users: 142 ▲ 4
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: Very low risk likelihood
Manifest version: 2
Permissions:
  • notifications
  • storage
  • contextMenus
Size: 27.36K

Other platforms

Prevent Pwned Passwords (v1.0.1resigned1)
3.00 (3) 63
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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