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Secure Passphrase Generator

Generate XKCD-style diceware passphrases with adjustable word count and separators.

Best for: A master password for your password manager, a device login, or anywhere you must remember the secret yourself.

Complete guide
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Input

How it's calculated & sources
The Secure Passphrase Generator uses the standard, deterministic formula, so the same inputs always produce the same result. It runs entirely in your browser, so your inputs are never uploaded. Last reviewed June 2026.

Free & no sign-up · runs entirely in your browser. Results are estimates for general information, not professional advice — verify important decisions with a qualified expert. Last reviewed June 2026.

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Complete guide

Quick answers

Short, sourced answers to the questions people (and AI assistants) ask most.

What is Secure Passphrase?
A secure passphrase generator builds a password from several random words — long, strong and far easier to remember and type than a random string of symbols.
Why does Secure Passphrase matter?
A handful of random words gives plenty of entropy — for example, five or six words from a large list comfortably exceed the strength of a typical complex password, while staying memorable.
How is Secure Passphrase calculated?
It picks words at random from a large list (a diceware-style approach) using your browser's secure random source. Strength comes from the number of words and the size of the word list: entropy equals words multiplied by the log base 2 of the list size.
What are common secure passphrase mistakes?
Choosing words yourself instead of letting them be random — quotes and phrases are guessable.
When should you use the Secure Passphrase Generator?
A master password for your password manager, a device login, or anywhere you must remember the secret yourself.

What is the Secure Passphrase Generator?

A secure passphrase generator builds a password from several random words — long, strong and far easier to remember and type than a random string of symbols.

How the Secure Passphrase Generator works

It picks words at random from a large list (a diceware-style approach) using your browser's secure random source. Strength comes from the number of words and the size of the word list: entropy equals words multiplied by the log base 2 of the list size.

Key terms

Diceware:
Generating passphrases by selecting random words from a numbered list.
Entropy:
Randomness in bits; more words and a bigger list add more.

Common mistakes to avoid

  • Choosing words yourself instead of letting them be random — quotes and phrases are guessable.
  • Using too few words to save typing.
  • Reusing the same passphrase across accounts.

Keywords: passphrase, diceware, xkcd, words.

Sources: NIST SP 800-63B — Digital Identity Guidelines

Reviewed by the Free Tools Galaxy editorial team · Updated June 2026 · Calculated privately in your browser.

Frequently asked questions

Is the Secure Passphrase Generator free to use?+

Yes. Every tool on Free Tools Galaxy is 100% free, runs in your browser and requires no signup.

How accurate is the Secure Passphrase Generator?+

Secure Passphrase Generator uses the standard secure passphrase formula in double-precision arithmetic, so the same inputs always produce the same result and you can verify any figure by hand. It is an educational estimate — real-world outcomes depend on your actual rates, rules and assumptions.

Do you store my inputs?+

No. The Secure Passphrase Generator runs entirely in your browser. Nothing is uploaded or saved to a server.

Can I use the Secure Passphrase Generator on mobile?+

Yes — the interface is fully responsive and works on phones, tablets and desktops.

What are common mistakes to avoid?+

The most frequent mistake is mixing units. Double-check your inputs use a single, consistent unit before clicking Calculate.

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Title: I built/used this free secure passphrase generator — instant, no signup

Body: Generate XKCD-style diceware passphrases with adjustable word count and separators. Try it: https://freetoolsgalaxy.com/tools/secure-passphrase-generator
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Secure Passphrase Generator on Free Tools Galaxy — Generate XKCD-style diceware passphrases with adjustable word count and separators. https://freetoolsgalaxy.com/tools/secure-passphrase-generator
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# Secure Passphrase Generator — the free tool I keep coming back to

Generate XKCD-style diceware passphrases with adjustable word count and separators.

Try it: https://freetoolsgalaxy.com/tools/secure-passphrase-generator
Quora answer
The fastest way is to use a free in-browser secure passphrase generator: https://freetoolsgalaxy.com/tools/secure-passphrase-generator. Generate XKCD-style diceware passphrases with adjustable word count and separators.

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