Password Generator & Strength Analyzer

This tool uses zxcvbn, Dropbox's open-source password strength estimator. Unlike simple rule-based checkers, zxcvbn detects common patterns including dictionary words, keyboard sequences (qwerty), dates, repeated characters, and l33t substitutions. It calculates actual entropy and provides realistic crack time estimates.

Random passwords offer the highest entropy per character and are ideal for accounts protected by a password manager. Passphrases (e.g., 'Correct-Horse-Battery-Staple') are easier to remember and type, making them better for master passwords or systems where you need to enter the password manually. A 4-word passphrase provides roughly 51 bits of entropy.

Yes. All password generation uses the Web Crypto API (crypto.getRandomValues), which provides cryptographically secure random numbers backed by your operating system's entropy source. No passwords, settings, or analysis results are ever transmitted over the network. You can verify this by checking your browser's Network tab.

Yes, once the page is loaded, the password generator works completely offline. The strength analysis library (zxcvbn) is loaded on first use and cached by your browser. No internet connection is required for generating, analyzing, or exporting passwords.

This option removes visually similar characters from generated passwords: 0 (zero) and O (letter O), l (lowercase L), 1 (one), and I (uppercase i). This is useful when passwords need to be read aloud, typed from paper, or used in contexts where font rendering makes these characters indistinguishable.