Our mission is simple: make password security accessible to everyone.
Billions of accounts are compromised every year because of weak or reused passwords. Most people don't get real feedback on whether their password is actually secure — they just see a colored bar that doesn't mean much.
We built PasswordStrength.net to change that. Using the zxcvbn engine (originally developed by Dropbox), we give you a realistic picture of how long it would actually take an attacker to crack your password — not just how many character types you've used.
And we do it completely in your browser. Your passwords never leave your device.
Privacy First
Everything runs in your browser. We have no back-end that ever receives your passwords. No analytics on what you type. No logs.
Honest Feedback
We won't tell you a password is "strong" just because it has a capital letter and a number. We use real attack modeling to give you real answers.
Always Free
Password security shouldn't cost money. Our core tools will always be free and ad-free. No paywalls, no upsells, no sign-ups required.
Open Source
Don't take our word for it. Our code is open for review. The zxcvbn library we rely on is fully auditable and battle-tested in production.
No Bloat
Fast, focused tools. We don't clutter the experience with features that don't serve your security. Simple UI, serious engineering.
Accessible
We design for everyone — from security professionals to people checking a password for the first time. Plain language, clear visuals.
Constantly Updated
The threat landscape evolves fast. We keep our tools, wordlists, and guidance current with the latest security research and breach data.
Works Everywhere
Desktop, tablet, or phone — our tools are fully responsive and tested across all modern browsers. No app download required.
Community Driven
We listen to feedback from real users. Feature suggestions, bug reports, and security disclosures are all taken seriously and acted upon.
Ready to test your password?
Use our free strength checker — no account required, nothing ever leaves your browser.
Try the Checker →