Google Password Checkup

We want to help you stay safe not just on Google, but elsewhere on the web as well. This is where the new Password Checkup Chrome extension can help. Whenever you sign in to a site, Password Checkup will trigger a warning if the username and password you use is one of over 4 billion credentials that Google knows to be unsafe.
Password Checkup was designed jointly with cryptography experts at Stanford University to ensure that Google never learns your username or password, and that any breach data stays safe from wider exposure. Since Password Checkup is an early experiment, we’re sharing the technical details behind our privacy preserving protocol to be transparent about how we keep your data secure.

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Today we’re launching the Password Checkup—a new feature built into our password manager that checks the strength and security of all of your saved passwords, tells you if we find they’ve been compromised (for example, in a breach), and gives you personalized, actionable recommendations when needed.

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With a single click, the Password Checkup tells you if:

Your passwords have been compromised in a third-party breach. We’ve found more than 4 billion usernames and passwords that have been exposed due to third-party breaches. If any of these are yours, attackers could have these passwords and access your information.

Your passwords are being reused across different sites. If someone gets access to a password that you reuse on multiple sites, they can use it to sign into your other accounts as well.

Your passwords should be strengthened. Weak passwords can be easily guessed by attackers, putting your personal information at risk.

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The Password Checkup is built from our Chrome extension launched earlier this year, which alerts you if your username or password has been compromised in a third-party data breach. The extension has been downloaded more than 1 million times, with nearly half of those users receiving a warning for a compromised password. Later this year, we’ll build Password Checkup technology directly into Chrome for everyone—so you get real time protection as you type your password without needing to install a separate extension.

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