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Generate Master Password for Password Managers

A diceware passphrase is ideal for your password manager master key β€” high entropy, memorable.

Nid oes angen mewngofnodi

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48 bits
Entropy
8 hours
Crack time @ 10B guesses/sec

Why diceware? Memorable phrases of random words have huge entropy and are easier to remember than gibberish like β€œX#9mP$qZ”. A 5-word phrase has more entropy than a 10-character random password with mixed case + symbols.
πŸ”’ All randomness comes from crypto.getRandomValues() in your browser. No words, passphrases, or any data are sent anywhere.

Master Password tips

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Your master password must be both memorable (you can't reset it) and strong. A 6-word diceware phrase nails both β€” 60+ bits of entropy, easy to remember.

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Use a memorable but non-personal phrase. Don't pick words that have meaning to you ("cat dog house" is too predictable). Trust the random generator.

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Master passwords protect everything else. Make this 5-6 words minimum. Anything less is risky.

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Practice typing it a few times before saving anywhere. Once you can type it from muscle memory, you'll never forget it.

Sut Mae'n Gweithio

1
Ewch i mewn
Enter your data into the tool above. Everything stays local to your browser.
2
Proses
The tool processes your data instantly in your browser using JavaScript. No server, no waiting.
3
Lawrlwythwch
Get your result instantly. Nothing is stored after you leave the page β€” complete privacy.

Pam defnyddio ein un ni?

βœ“Hollol rhad ac am ddim - dim costau cudd, byth
βœ“Nid oes angen cyfrif, e-bost na mewngofnodi
βœ“Nid yw ffeiliau byth yn gadael eich dyfais
βœ“Dim cyfyngiadau maint ffeil o gwbl
βœ“Dim dyfrnodau ar unrhyw allbwn

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