Strength is estimated from entropy: password length combined with how many different character types you use. The crack-time estimate assumes an offline attack at 10 billion guesses per second — a rough guide, not a guarantee.
All tools/Generators
Password Strength Checker
Check how strong a password is and why. Runs entirely in your browser — nothing you type is sent anywhere.
- At least 12 characters
- Lowercase letters
- Uppercase letters
- Numbers
- Symbols
How this works & FAQ
Is my password sent anywhere?
No. Everything is calculated locally in your browser as you type; nothing is transmitted or logged.
Does this check against known leaked passwords?
No, it only estimates strength from length and character variety. A password could score well here and still appear in a breach list — using a password manager to generate unique passwords is safer.