How the entropy estimate works
Entropy is length × log2(character pool size) — the number of bits of uncertainty in the result assuming every character is drawn uniformly at random, which is what happens here.
Strong Password Generator
Generate strong, random passwords with configurable length and character sets directly in your browser. Nothing is uploaded, and generated values are never stored.
English
≈ 103.1 bits · very strongcenturies at 1010 guesses/s
Generated locally. Nothing is uploaded, and generated values are never stored.Password
Character classes and ambiguous characters
Enabling more classes (lowercase, uppercase, digits, symbols) grows the pool and the entropy per character. Excluding ambiguous characters (I, l, 1, O, 0, o) trades a small amount of entropy for fewer transcription mistakes when typing a password by hand.
Frequently asked questions
The crack-time estimate assumes a full offline search at a stated guess rate — it is a worst-case reference point, not a prediction of how any specific attacker or service is configured.