Advanced Password Generator
Create secure passwords with entropy meter, strength scoring, and passphrase mode.
All passwords are generated locally in your browser using the Web Crypto API (crypto.getRandomValues). No password ever leaves your device or is sent to any server.
Cryptographically Secure Password Generation Explained
Weak passwords are the #1 cause of data breaches. This generator uses the Web Crypto API (crypto.getRandomValues) — the same cryptographic primitive browsers use for TLS — to produce truly random passwords with measurable entropy. Unlike Math.random(), which is predictable and unsafe for security, the Web Crypto API draws from the operating system's secure entropy pool, making generated passwords resistant to brute-force and dictionary attacks.
Web Crypto API Randomness
Uses crypto.getRandomValues() for true cryptographic randomness — not Math.random() which is predictable and unsafe for passwords.
Three Generation Modes
Random characters for maximum entropy, memorable passphrases for human recall, and pronounceable passwords that are easy to type.
Entropy & Strength Scoring
Calculates real Shannon entropy in bits and rates strength from Weak to Very Strong so you know exactly how secure your password is.
Ambiguous Character Exclusion
Optionally removes look-alike characters (il1Lo0O) to prevent transcription errors when passwords are read aloud or handwritten.
Key Takeaways & Benefits
- A 16-character random password with all character types has ~96 bits of entropy — billions of years to brute-force.
- Math.random() is predictable and should never be used for passwords; always use the Web Crypto API.
- Memorable passphrases of 4+ random words can be stronger than short complex passwords and far easier to remember.
- Passwords generated here never leave your browser — no server processing, no logging, no tracking.
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