Passphrase Generator
Generate memorable random passphrases
Passphrase Generator is a free online tool from BrowserUtils that generate memorable random passphrases. It runs entirely in your browser — your data never leaves your device. No account required.
chair-fleet-logic-exist
Entropy: ~37 bits (661-word list, 4 words)
How to use Passphrase Generator
- 1 Paste or type your input into the editor above.
- 2 The tool processes your data instantly — right in your browser, with nothing sent to a server.
- 3 Copy the result with one click or continue editing your input.
About Passphrase Generator
Free online passphrase generator. Create strong, memorable passphrases from random words, inspired by the diceware method. Configurable word count and separator. This tool runs entirely in your browser — your data is never sent to a server. Just paste your input, get instant results, and copy with one click. No sign-up or installation required.
Passphrase Generator specs
- Runtime
- 100% client-side (browser)
- Built on
- Web Crypto API (SubtleCrypto) for hashing and crypto.getRandomValues for secure randomness
- Cost
- Free — no account, no rate limits, no usage caps
- Browser support
- Chrome 90+, Firefox 88+, Safari 14+, Edge 90+
- Part of
- 299 developer tools on BrowserUtils (100% client-side)
Questions
How secure is a passphrase?
A 4-word passphrase from a 7776-word list provides about 51 bits of entropy. Each additional word adds ~13 bits. A 6-word passphrase is considered very strong for most purposes.
What word list is used?
This tool uses a built-in list of common English words. Each word is selected using cryptographically secure random numbers.
What is the diceware method?
Diceware is a method for generating passphrases using dice rolls to randomly select words from a numbered word list. This tool uses the same principle but with a cryptographic random number generator instead of physical dice.
How many words should my passphrase have?
Use at least 4 words for general accounts and 6 or more words for high-security accounts. Each additional word roughly doubles the time needed to crack the passphrase 8,000 times over.
Is the passphrase generator safe to use online?
Yes, passphrases are generated entirely in your browser using cryptographically secure randomness. No words or passphrases are sent to a server or logged anywhere.
Can I customize the separator between words?
Yes, you can choose a separator like a hyphen, space, period, or any character. Using a non-standard separator adds a small amount of extra unpredictability beyond the word selection itself.
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