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February 14, 2026 · numbers · 4 min read

How to Generate Strong Passwords Online

A short, practical guide to picking passwords that resist modern attacks — what length, what character classes, and what to skip.

Last updated February 14, 2026 · 4 min read

What makes a password "strong" in 2026

Password strength comes down to one thing: entropy — how many guesses an attacker would have to try, on average, to find yours. Entropy depends on:

  • Length. Each extra character multiplies the search space.
  • Character set. Lowercase only is 26 options per slot. Adding uppercase, digits, and symbols pushes that toward 90+.
  • Randomness. "P@ssw0rd!" looks complex but appears in every cracking dictionary. A truly random string of the same length is millions of times harder to crack.

Modern guidance from NIST is essentially: make it long, make it random, and don't reuse it.

A working baseline

For accounts you actually care about:

  • 16+ characters for general-purpose passwords.
  • 20+ characters for password manager master passwords and email accounts.
  • Mix of lowercase, uppercase, digits, and at least one symbol — unless the site refuses symbols, in which case lean harder on length.

What to avoid

  • Dictionary words and substitutions like Tr0ub4dor. Cracking tools have been doing those substitutions since the 90s.
  • Personal info — birthdates, pet names, anything someone could pull off your public profiles.
  • Reuse. One leaked site shouldn't compromise five others. Use a password manager.

Where the generator fits

A good password generator gives you cryptographically random output at the length and character set you specify, so the only step you're responsible for is storing it safely — in a password manager, not a sticky note.

Use the Password Generator to produce one now. Pick 20 characters with mixed case, digits, and symbols, then save it directly to your password manager.

A few generators that pair well with the topics above:

Passphrases, managers, and two-factor

A random 20-character string is the strongest option, but it is also impossible to memorise — which is fine for the ninety-odd accounts a password manager remembers for you, and a problem for the two or three you must type from memory. For those, a passphrase of four to six random words ("anchor-velvet-tundra-cobalt") is the sweet spot: high entropy because the words are chosen at random, yet far easier to recall and type than symbols. The key word is random — a phrase you wrote yourself is far weaker than one a generator picked for you.

Whatever you generate, two habits matter more than the password itself. First, store it in a password manager rather than a note, a spreadsheet, or your memory; the manager becomes the one strong password you protect carefully. Second, turn on two-factor authentication wherever it is offered. Even a leaked password is far less dangerous when a second factor — an authenticator app or a hardware key — stands between an attacker and your account. A strong password is the foundation, but a manager and 2FA are what make it hold up in the real world.

Why use a strong password generator?

A strong password generator earns its place by saving time. Instead of starting from nothing, you get accurate values and figures instantly, then refine from there — which is almost always faster than building the same thing by hand. The best tools of this kind run entirely in your browser, cost nothing, and never ask you to sign up, so you can generate as many times as you like until something fits.

Good to know

Is a strong password generator free to use?

It should be completely free. There is no premium tier and no paywall on a quality strong password generator; every result is available to everyone.

Do I need an account or any installation?

No. A browser-based strong password generator needs no download and no login, and because it runs locally your inputs stay on your own device.

Does it work on mobile devices?

It works anywhere a modern browser does — mobile or desktop — with the same instant result on each.