Password & Passphrase Generator — Cryptographically Secure

100% Cryptographically Secure Powered entirely by crypto.getRandomValues(). Passwords are never saved to browser storage or servers.

Zero Telemetry • Zero Persistence

Presets:

Very Strong 98.5 bits entropy

Crack time est.: ~1.2 Billion Years

Password Length

chars

Presets:

Character Sets

Uppercase (A-Z) ABCDEFGHIJKLMNOPQRSTUVWXYZ

Lowercase (a-z) abcdefghijklmnopqrstuvwxyz

Numbers (0-9) 0123456789

Special Symbols !@#$%^&*()_+-=[]{}|;:,...

Custom Symbol Characters (editable):

Readability & Rules

Require At Least One From Each Set Guarantees no enabled character category is missing by chance.

Exclude Visually Similar Characters Removes l, 1, I, O, 0, o, |, i, L to avoid transcription errors.

Exclude Duplicate Characters Ensures no character repeats in the generated password.

Number of Words

words

Word count:

Word Separator

Capitalization

Number Injection

Symbol Injection

Batch Password Generator

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Clipboard Security & Auto-Clear

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🎲 Cryptographic Randomness

This generator exclusively uses window.crypto.getRandomValues() with uniform rejection sampling. Standard Math.random() is pseudo-random and vulnerable to state prediction; Web Crypto uses OS-level entropy pools.

📐 Real Shannon Entropy

Strength is measured by true mathematical entropy: $E = L \times \log_2(N)$ bits. We calculate exact pool combinations rather than relying on arbitrary superficial length heuristics.

💬 What is Diceware?

Diceware generates passphrases from memorable English words. A 5-word Diceware passphrase provides ~64 bits of entropy—stronger than an 8-character random string, yet effortlessly memorable.

🔒 Zero Storage Guarantee

Generated passwords are never persisted to localStorage, IndexedDB, or cookies, and never leave your device. Make sure to paste or save your password in your password manager before leaving.