Free tool
Password Strength Checker and Generator
Test how strong a password really is, then generate one that holds up. Your password never leaves your browser.
Test a password
Private by design: nothing you type is sent, stored, or logged.
Waiting for input
Generate a strong password
Generated with your device's cryptographically secure random number generator. The result never leaves this page.
Estimates come from zxcvbn, an open source strength estimator that checks patterns, common words, and known passwords. They assume an attacker making ten billion guesses per second against a stolen password database.
Runs entirely in your browser. Nothing is sent, stored, or logged.
StrongPass Password Generator
Use StrongPass on iPhone to generate passwords, review strength, and keep private items local behind biometrics.
Password strength questions
Is my password sent anywhere?
No. The password strength checker runs in your browser. The password you type is not sent, stored, logged, or saved by this tool.
How is password strength calculated?
The checker uses zxcvbn to look for length, patterns, common words, repeated characters, and known password structures, then reports an offline crack-time estimate.
How does the password generator choose characters?
The generator uses crypto.getRandomValues with unbiased random selection and a secure shuffle, so generated characters are not selected with Math.random.
A free tool by NextTap. Runs entirely in your browser.