How much entropy does a 6-word Diceware phrase have?

6 words × log₂(7776) ≈ 6 × 12.92 ≈ 77.5 bits of entropy — far beyond any online or offline brute-force attack.

Is the randomness truly cryptographic?

Yes. Words are selected using window.crypto.getRandomValues() — the browser's CSPRNG — not Math.random().

Diceware Passphrase Generator

Cryptography & Security

Generate memorable high-entropy passphrases using the EFF Diceware wordlist and cryptographically secure randomness. Configurable word count, delimiters, and complexity.

Diceware Memorable Passphrase Generator

Generate memorable, mathematically uncrackable passphrases using hardware entropy and EFF wordlists.

3/3 Free Daily Uses

Generated Passphrase66.5 bits

Security Strength:Strong

Estimated Brute-force Time: Millions of years

Passphrase Configuration

Word Count:5 words

3 words (39 bits)5 words (65 bits - Standard)8 words (104 bits)

Word Separator:

Capitalize First Letters (TitleCase)Append Random Numbers (00-99)Append Special Symbol (!@#$)

Alternative Passphrase Options

Why Diceware? Combining real words randomly produces phrases that are painless for human memory but mathematically impossible for brute-force attacks to crack.

Tool Overview & Guide

What is Diceware Passphrase Generator?

Generate cryptographically secure, high-entropy passphrases using the Diceware method and EFF wordlists. Produces memorable multi-word passphrases that resist supercomputer brute-force attacks while remaining easy for humans to type and recall.

Technical Specifications & Supported Formats

Processing Engine:SubtleCrypto Web API (Hardware-Accelerated 256-bit AES/SHA)

Privacy & Security:100% In-Browser (Zero File Upload)

Supported Formats:Plaintext, SHA-256, AES-GCM, PII patterns

Max File Limit:Local In-Memory

How to use Diceware Passphrase Generator

3 simple steps to complete your task directly in your browser:

Select Word Count & Entropy Target
Choose between 3 to 8 random words. The live meter calculates the exact Shannon entropy bits and crack-time difficulty.
Customize Delimiters & Complexity
Choose separators like hyphens, spaces, underscores, or periods. Optionally capitalize words or append random numbers and symbols.
Generate with Hardware Cryptography
Click Generate to sample true hardware randomness using `window.crypto.getRandomValues()` with 100% in-browser generation.

Common uses

Master Passwords: Create memorable yet impenetrable master passwords for 1Password, Bitwarden, or KeePass.
Disk & OS Encryption: Set easy-to-type passphrases for BitLocker, FileVault, LUKS, or VeraCrypt bootloader prompts.
Hardware Security Tokens: Generate high-entropy PINs and passphrases for YubiKeys and Ledger/Trezor devices.
SSH & PGP Key Passphrases: Guard RSA and Ed25519 private keys against offline dictionary brute-force.

Why choose VersaTools

100% private

Your files are processed inside your browser and are never uploaded to a server.

Free, no account

No sign-up, no watermark, no paywalled “premium” tier. Just open a tool and use it.

Instant

No upload, no queue, no server round-trip — work starts the moment you drop a file.

Runs in your browser

Built on open web standards. Works on any modern desktop browser, nothing to install.

No upload size caps

Nothing leaves your device, so there’s no server file-size limit — only your machine’s memory.

Yours to keep

Results download straight to your device in clean, standard file formats.