Are the passphrases stored or sent anywhere?

No. Generation is entirely client-side in your browser. Nothing leaves your device.

How secure is a 4-word passphrase?

With a 256-word list, each word adds 8 bits of entropy. Four words give ~32 bits, five words ~40 bits, six words ~48 bits. For high-security use, choose 6 or more words.

Why are common words used instead of random characters?

Word-based passphrases are far easier to remember and type while still providing strong entropy, making them practical for daily use.

Can I trust Math.random() alternatives on this site?

This tool never uses Math.random(). All random picks come from crypto.getRandomValues(), which is cryptographically secure.

Passphrase Generator

Name: Passphrase Generator
Availability: InStock
Author: Nham Vu

Generate memorable, cryptographically random passphrases from word lists (Diceware-style) with entropy estimates.

Settings

Number of words: 5

345678

Separator

Capitalize first letter

Your Passphrase

Click Generate

Strength Analysis

Entropy (bits)

Words

Characters

Strength --

Word Breakdown

Generate a passphrase to see words

Copied!

Summary

Generate memorable, cryptographically random passphrases from word lists (Diceware-style) with entropy estimates.

How it works

The generator picks words from an embedded 256-word list using cryptographically secure random indices via crypto.getRandomValues(). Entropy is calculated as log2(wordlist_size ^ word_count). You can customise the separator and word count, then copy the result with one click.

Use cases

Create a strong master password for a password manager.
Generate memorable login credentials without sticky notes.
Produce passphrases for disk encryption or SSH keys.
Teach password security by demonstrating entropy vs memorability.

Frequently Asked Questions

Last updated: 2026-06-09 · Reviewed by Nham Vu