What is Passphrase Generator?
The passphrase generator is a free online security tool built on the Diceware idea — it draws words randomly from 256 carefully selected English words. Each word adds 8 bits of entropy, so 6 words already exceed 48 bits. You can configure word count (3–8), separator (hyphen/underscore/dot/space/none), random capitalization, and digit/symbol insertion. The tool shows estimated entropy and a strength rating in real time. Passphrases are far easier to remember than short random passwords while being much harder to brute-force — ideal for master passwords, encryption keys and account credentials. Everything is generated locally using the cryptographically secure crypto.getRandomValues; your passphrase never leaves your device.
▶Use Cases5 scenarios
- ◆Master passwords for password managers
- ◆Encryption keys and recovery phrases
- ◆High-security account credentials
- ◆Security awareness demos
- ◆Developer test data
▶How to Use4 steps
- 1Set the word count (6+ recommended)
- 2Choose a separator
- 3Toggle digits/symbols/capitalization as needed
- 4Click Generate and copy
▶Features6 features
- ✓Diceware-style wordlist
- ✓3–8 adjustable words
- ✓Multiple separators
- ✓Digit and symbol insertion
- ✓Entropy and strength rating
- ✓Cryptographically secure RNG
▶FAQ7 questions
What is Passphrase Generator?
An online passphrase generator using a Diceware-style wordlist to create high-entropy, memorable passphrases with configurable words, separators and symbols.. Everything runs locally in your browser — no uploads.
What is the difference between a passphrase and a password?
A passphrase is several words long, like correct-horse-battery-staple. It is easier to remember than a short password, yet harder to brute-force thanks to its length and higher entropy.
How much entropy do 6 words give?
This tool uses a 256-word list (8 bits per word), so 6 words give about 48 bits, rising to ~54 bits with a digit and symbol — enough to resist online brute-force attacks.
Is the random source secure?
Yes. It uses the Web Crypto API (crypto.getRandomValues), a cryptographically secure generator — never the predictable Math.random.
Are generated phrases saved or uploaded?
No. Everything runs locally; the phrase disappears when you refresh the page. No server ever sees it.
Can I use it for an important master password?
Yes. Use 6–8 words and store it in a password manager. Avoid generating on public computers.
Won't an attacker guess the wordlist?
The wordlist is public — that is the Diceware design. Security comes from randomness and length (entropy), not from secrecy of the list.