Password Strength Checker — How Secure Is Your Password?

Back

Your Password

Show

Enter a password above to see its strength.

🔒 Privacy guaranteed — Your passwords are processed entirely in your browser and are never sent to any server.

What Makes a Password Strong?

A strong password combines length, complexity, and unpredictability. The four key components are uppercase letters, lowercase letters, numbers, and special symbols. This tool uses the zxcvbn library — the same algorithm used by security researchers — to estimate how long it would take a computer to crack your password.

Password Strength Levels Explained

Strength Level	Score	What It Means
Very Weak	0/4	Crackable in seconds. Common words, keyboard patterns, or very short passwords.
Weak	1/4	Crackable in minutes to hours. Simple substitutions (p@ssw0rd).
Fair	2/4	Crackable in days to weeks. Better, but still vulnerable to targeted attacks.
Good	3/4	Crackable in months to years. Suitable for most non-critical accounts.
Excellent	4/4	Practically uncrackable. Long, random, mixed-character passwords.

Tips for Creating Strong Passwords

Use at least 12 characters — length is the most important factor
Mix uppercase, lowercase, numbers, and symbols
Avoid dictionary words, names, dates, and keyboard patterns
Use a passphrase: random words strung together (e.g., "correct-horse-battery-staple")
Never reuse passwords across multiple accounts
Use a password manager to generate and store unique passwords

Is This Tool Safe to Use?

Yes. This password checker runs entirely in your browser using JavaScript. Your password is never sent to any server and never stored anywhere. The strength calculation is performed locally by the open-source zxcvbn library, which you can inspect in the browser's developer tools.