Password Strength Checker
Analyze the strength of a password as you type.
Runs entirely in your browser.
Password Strength Checking Tool
Suggestions
- ✖ Use at least 12 characters (currently 9)
- ✔ Mix of uppercase and lowercase letters
- ✔ Contains numbers
- ✖ Add symbols like !@#$%
- ✔ Not a commonly used password
- ✔ No sequential characters
- ✔ No repeated characters
- ✔ No keyboard patterns
This check happens entirely in your browser with JavaScript. Nothing you type is transmitted, stored, or logged.
About Password Strength
Password strength is usually measured in entropy - the number of bits of unpredictability a password contains. It depends on two things: the size of the character set you draw from (lowercase, uppercase, digits, symbols) and the length of the password. Each extra character multiplies the number of possible passwords, which is why length matters more than complexity tricks.
Attackers rarely guess randomly. They start with lists of common passwords and dictionary words, then try predictable patterns like keyboard rows (qwerty), sequences (abc123), and simple substitutions (p@ssw0rd). A password that appears in a leaked-password list can be cracked in seconds no matter how long it is, which is why this tool penalizes common passwords and recognizable patterns heavily.
The crack-time estimates shown here assume a throttled online attack (about 10,000 guesses per second against a login form) and an offline GPU attack (about 10 billion guesses per second against a stolen database of fast hashes). For strong protection, aim for 12-16 or more characters, mix character types, avoid real words and personal information, never reuse passwords across sites, and use a password manager so every account can have a unique random password.
