Password Strength Checker
Free password strength checker. Test your password's security, see how long it would take to crack, and get tips for stronger passwords.
Password Strength Checker
Test how secure your password really is. This tool analyzes password length, complexity, and entropy to estimate how long it would take a computer to crack. Get instant feedback and actionable suggestions to improve weak passwords.
How Password Strength Is Calculated
The checker evaluates multiple factors:
- Length: Each additional character exponentially increases security
- Character variety: Using uppercase, lowercase, numbers, and symbols increases entropy
- Randomness: Dictionary words and patterns dramatically reduce strength
- Common passwords: Checked against databases of known weak passwords
Crack Time Estimates
The tool estimates how long a determined attacker with modern hardware (capable of 100 billion guesses per second) would need to crack your password:
- Instant: Common passwords found in dictionary attacks
- Seconds to hours: Short or simple passwords
- Days to years: Moderate length with mixed characters
- Centuries+: Long, random passwords with full character variety
What Makes a Strong Password?
- At least 12 characters (16+ recommended for important accounts)
- Mix of uppercase, lowercase, numbers, and symbols
- No dictionary words or personal information
- No predictable patterns (abc123, qwerty, etc.)
- Unique for each account
Is This Tool Secure?
Yes. All analysis happens in your browser using JavaScript. Your password is never sent to any server. For maximum paranoia, you can test a similar password rather than your actual one — the strength analysis will be nearly identical.