Secure Passphrase Generator
Generate diceware-style memorable secure passphrases
100% free. Runs entirely in your browser - your files and data never leave your device and nothing is uploaded to any server.
zoom willow clover zenith veldtWhy passphrases?
A passphrase combines several random words. It's easier to remember than a random string, yet entropy grows quickly - each word from a 256-word list adds ~8 bits (log₂(256)). Six words yields ~48 bits of word-selection entropy, which exceeds many random passwords.
This generator uses crypto.getRandomValues() - the same CSPRNG used by hardware tokens. Math.random() is never used.
About this tool
A passphrase is a password made of multiple random, unrelated words (like "correct-horse-battery-staple") rather than a jumble of characters - often easier to remember while still being highly resistant to brute-force attacks due to the huge number of possible word combinations. This tool generates diceware-style random passphrases using a large word list.
How to use this tool
- Set word count and separatorChoose passphrase length and delimiter format that target system accepts.
- Generate random phraseCreate diceware-style unrelated word combinations.
- Optional hardening tweaksAdd capitalization, numbers, or symbols only if policy demands.
- Store securelySave in password manager and avoid plain-text sharing/storage.
How many words a passphrase needs
Each word picked at random from a standard 7,776-word diceware list adds about 12.9 bits of entropy. Five words give about 65 bits and six words about 77 bits - strong enough for a password manager master password.
The words must be chosen randomly, not by you; a phrase you make up yourself, such as a song lyric, is far easier to guess. Separators and a capital letter add a little strength but are optional.
Key features
- Creates memorable yet high-entropy authentication secrets.
- Reduces user lockouts compared to complex random character strings.
- Excellent for human-typed credentials and encryption passphrases.
- Supports customizable format requirements.
Common uses
- Generating master passwords for password managers.
- Creating strong passphrases for encrypted backups.
- Provisioning user-friendly secure credentials for teams.
- Replacing weak pattern-based passwords with random word phrases.
Tips for better results
- Use at least 5-6 random words for critical accounts.
- Keep words truly random; do not manually choose familiar phrases.
- Prefer password manager storage over memorization-only strategy.
- Enable MFA to complement passphrase security.
Mistakes to avoid
- Choosing famous quotes instead of random word combinations.
- Using too few words for sensitive accounts.
- Reusing same passphrase across services.
- Storing passphrase in unencrypted notes/chat apps.
Frequently asked questions
A sufficiently long passphrase (typically 5-6+ random words) can have comparable or greater entropy than a shorter complex password, while being significantly easier for a human to remember and type accurately.
Diceware is a method of generating passphrases by randomly selecting words from a large, fixed word list (traditionally using physical dice) - it guarantees true randomness in word selection, which is what actually makes the passphrase's entropy calculable and trustworthy.
More words mean higher entropy and better security - 5-6 random words from a large wordlist is a commonly recommended baseline for strong, memorable passphrases.
Only if a site requires them. Adding one more random word adds more strength than a symbol, and keeps the passphrase easy to type.
For the few secrets you must remember: your password manager's master password, your computer login and your main email account. Let the password manager generate the rest.
Better not. People choose related or famous phrases that attackers' word lists include. Letting a random generator pick unrelated words is what makes a passphrase strong.