Diceware Passphrase Generator

This tool generates strong, memorable passphrases by stringing together randomly chosen words, the approach known as Diceware. The idea, popularised by security experts, is that a password made of several random everyday words is both far easier for a human to remember and far harder for a computer to crack than a short jumble of random characters. A passphrase like correct-harbour-jelly-window is more secure than something like P@ss12, because its strength comes from length and the huge number of possible word combinations, yet you can actually picture and recall it. The security comes entirely from the words being chosen at random, not by a person, since people pick predictable words and patterns. This generator uses your browser's cryptographically strong random source to pick each word independently from a built-in word list, so the result is genuinely random. You choose how many words you want and the separator between them, and the calculator produces a passphrase along with an estimate of its entropy in bits, a measure of how hard it is to guess. The more words, the stronger and the longer the passphrase. A regenerate button gives you a fresh one whenever you like, and everything runs locally so the passphrase is never sent anywhere. Use it to create memorable passwords for accounts, a master password for a password manager, or a wifi or device passphrase. As a guide, four words give a reasonably strong passphrase and six or more give very strong security suitable for important accounts. This tool uses a curated word list, so the entropy shown reflects that list; dedicated Diceware lists with thousands of words give a little more entropy per word. Always use a unique passphrase for each important account.

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Words are chosen with a cryptographically strong random source, locally in your browser; nothing is sent. Entropy reflects the built-in word list. Use 4+ words.