Password Strength Meter & Generator — Free Interactive Tools

Interactive password strength meter with zxcvbn analysis and cryptographically secure password generator. Everything runs in your browser — your passwords never leave your device.

📊 Password Strength Meter

🔒 Powered by zxcvbn (Dropbox's password strength estimator). Real-time analysis with no data sent to any server.

Enter a password above

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Score (0–4)

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Est. Crack Time

🔑 Password Generator

🔒 Uses crypto.getRandomValues() for true cryptographic randomness. Generated entirely in your browser.

Length: 16

Uppercase (A–Z) Numbers (0–9) Symbols (!@#$%^&*)

Lowercase letters (a–z) are always included · Min 8, Max 32 characters

How Password Strength Is Measured

The meter uses zxcvbn — a realistic password strength estimator developed by Dropbox. Unlike simple entropy calculators, zxcvbn recognizes:

Common patterns: keyboard walks (qwerty), sequences (123456), dates
Dictionary words: English words, common names, and their variations
Repeat patterns: like "abcabc" or "Passw0rdPassw0rd"
Spatial patterns: adjacent keys on the keyboard
L33t substitutions: "p@ssw0rd" → recognized as "password"

Score Levels

0 — Very Weak 🔴 Instant crack (< 1 second)
1 — Weak 🟠 Guessed in seconds/minutes
2 — Fair 🟡 Hours to days
3 — Strong 🔵 Months to years
4 — Very Strong 🟢 Centuries to crack

Why Cryptographically Secure Generation Matters

Our generator uses window.crypto.getRandomValues() — the browser's built-in CSPRNG (Cryptographically Secure Pseudo-Random Number Generator). This is the same source of randomness used for SSL/TLS keys and is not predictable, unlike Math.random().

💡 For best security, use a password manager to generate and store unique passwords for every site.

🔐 Password Tools