Passphrase generator — multilingual

Use several words chosen at random by a computer — not by you — from a large word list. Six random words give roughly 77 bits of entropy, which is strong for almost any purpose. Add more words for higher-value secrets. Length and randomness matter far more than mixing in odd symbols.

Yes. Every secret is generated locally in your browser with the Web Crypto API. Nothing you generate is ever transmitted, logged or stored. There are no accounts, no analytics and no cookies. You can even use the tool offline once the page has loaded.

Each language you add enlarges the pool of possible words, which increases entropy per word. We compute entropy from the real, deduplicated union of the selected lists, so overlapping words are counted once and the figure stays honest. Pick languages whose words you can comfortably read and type.

Classical crack time assumes ordinary hardware guessing as fast as a given rate. Quantum crack time accounts for Grover's algorithm, which only provides a quadratic speedup — effectively halving the entropy in the exponent. High-entropy secrets are not broken by quantum computers; the quantum figures are illustrative.

Entropy measures how many equally likely possibilities a secret was chosen from, in bits. Because we generate secrets ourselves, we know this exactly and compute it from first principles. Tools like zxcvbn estimate strength by pattern-matching, which underrates truly random secrets, so we don't use them here.