Check password strength
Evaluate realistic guessing patterns with zxcvbn: dictionaries, sequences, dates, repetition and predictable substitutions, without transmitting the password.
Features
Local evaluation
The password does not leave the browser.
Estimate, not a guarantee
The score is guidance; it does not prove a password is secure.
No breach lookup
We do not send the password or its hash to external services.
What the score means
The score uses zxcvbn, which estimates guessing effort from common passwords, words, names, keyboard patterns, dates, repetition and predictable substitutions. It remains an estimate, not a guarantee of security.
Frequently asked questions
Does it check breaches?
No. That type of check would require another data flow. This tool is deliberately local.
Does the score guarantee security?
No. It is an estimate and should be combined with good practices, unique passwords and, where possible, multi-factor authentication.