Password Intelligence
Unlock stronger security with our free online password strength checker. The Password Intelligence tool delivers instant, client-side analysis powered by open-source zxcvbn pattern detection and optimized for the Argon2id hashing algorithm which is used in our AES-GCM-256 Data Encryption App for key derivation. View crack-time estimates, tips, and best-practice guidance all without ever sending your password to a server.
Password Input
Note: Your password is NOT sent anywhere. Analysis is done locally in your browser.
Tips & Feedback
Weaknesses Detected:
Suggestions:
Analysis Results
Cracking Time Estimates:
How Password Strength Estimation Works
1. Pattern Matching (zxcvbn)
We scan for common words, names, sequences (
qwerty,12345), repeats, and substitutions (@→a,3→e).2. Entropy Calculation
Each pattern's unpredictability is measured to calculate overall guess entropy.
3. Crack Time Estimates
Guess counts translate into time estimates for fast hashes and Argon2id scenarios with a datacenter level attack or a single strong attacker.
4. Score Assignment (0-4)
0 = unusably weak | 4 = strong
“A passphrase like correct horse battery staple (~550 years at 1k guesses/sec) far outlasts Tr0ub4dor&3 (~3 days).”
Why Key Derivation & Salting Matter
Tips for Creating a Strong Password
Use a Passphrase
Combine random words ( correct-horse-battery-staple ) for length and memorability.
Avoid Predictable Patterns
No common substitutions ( @→a ) or sequences like 1234 .
No Personal Info
Skip names, birthdays, pet names—top hacker guesses.
Unique per Account
Use a password manager so one breach can't cascade.
Make It Long
Aim for 12+ characters; length beats complexity.
Enable 2FA
Authenticator apps or biometrics give a vital extra layer.
Try our customizable password generator in the here for truly random passphrases. The File and Text Encryption App on this site also uses this password generator and comes with a built-in password manager that can also managed via a master password.