Password Strength Checker
Test how strong your password is. Your password is analyzed locally in your browser and never sent to any server.
How It Works
This password checker uses zxcvbn, an advanced password strength estimation library developed by Dropbox. Unlike simple password checkers that only count character types, zxcvbn analyzes your password for:
- Common passwords and leaked password databases
- Dictionary words in multiple languages
- Common names and surnames
- Keyboard patterns (like "qwerty" or "12345")
- Date patterns and repeated characters
Tips for Strong Passwords
- Use at least 12 characters
- Mix uppercase, lowercase, numbers, and symbols
- Use a passphrase of random words
- Use a unique password for each account
- Consider using a password manager
- Use personal information (birthdays, names)
- Use common words or phrases
- Use keyboard patterns (qwerty, 12345)
- Reuse passwords across sites
- Share your passwords with others
Frequently Asked Questions
Is this password checker safe to use?
Yes, completely. Your password is analyzed entirely in your browser using JavaScript. It's never sent to our servers or stored anywhere. You can even use this tool offline.
What does "time to crack" mean?
This is an estimate of how long it would take an attacker to guess your password using offline attack methods. It assumes the attacker can make about 10,000 password guesses per second (a conservative estimate for modern hardware).
What makes a password strong?
A strong password is long (12+ characters), unpredictable, and unique to each account. Random combinations of words (passphrases) or truly random character strings are most secure.