Strong Password Generator Online

Password generator

Generated locally in your browser using the Web Crypto API. Never transmitted, logged, or stored — not even in this page's own analytics.

Why use this online generator

Why Trust This Generator?

Security tools should be verifiable, not just claimed. Here's exactly how this one works.

• Runs locally — every password is generated inside your own browser tab.
• Never stores passwords — nothing is written to a database, cookie, or local storage.
• Uses the Web Crypto API — a cryptographically secure random source, not a predictable one.
• No server communication — generation happens with zero network requests.
• No tracking of generated passwords — our analytics measure page visits, never password content.
• Free forever — no paywall, no account, no limits.

How This Generator Works

When you click Generate Password, your browser's Web Crypto API — crypto.getRandomValues() — supplies cryptographically secure random values. If you've enabled multiple character types, the generator first places one secure random character from each enabled set, fills the remaining length from the combined pool, then securely shuffles the whole result using a Fisher-Yates shuffle so the guaranteed characters aren't predictably placed. This avoids both a weak Math.random() source and the modulo bias that naive random-selection code can introduce.

Password Entropy Explained

Entropy measures how unpredictable a password is, in bits. Each extra bit doubles the number of guesses an attacker would need to try. The meter above calculates entropy directly from your chosen length and character sets — length multiplied by the base-2 logarithm of the pool size — not from a vague "weak/medium/strong" guess. This is an estimate of theoretical guesswork, not a guarantee about any specific attacker's real-world speed or method.

As a baseline, aim for at least 100 bits of entropy on any account that matters — roughly a 16-character password using all four character types.

Strong Passwords vs. "Strong-Looking" Passwords

A password isn't strong because it looks complicated to a human — it's strong because it's long and random enough that guessing it is computationally impractical. Substitutions like "P@ssw0rd1" look complex but are already accounted for by cracking-tool "mangling rules," so they add little real protection. Length and genuine randomness, not visual complexity, are what actually matter.

Choosing the Right Password for Each Account

Different accounts carry different risk, so length and character mix are worth adjusting:

• 8–11 characters: only acceptable for accounts you don't mind losing.
• 12–15 characters: an acceptable minimum if paired with two-factor authentication.
• 16–20 characters: the sweet spot for most accounts — strong and still practical with a password manager.
• 21–32 characters: ideal for admin accounts, financial logins, or a password manager's own master password.

For accounts you'd hate to lose, our strong password generator defaults to the higher end of this range. For a quick one-off password, the random password generator is built for speed.

Password Managers: Why You Need One

A password strong enough to resist real attacks isn't something most people can reliably memorize. A password manager solves that: generate a strong password (here, or inside the manager itself), save it once, and let the manager autofill it from then on. You only need to remember one strong master password for the manager itself, instead of dozens of weaker ones.

Two-Factor Authentication

Two-factor authentication (2FA) means a correctly guessed or leaked password still isn't enough to log in — the attacker also needs a rotating code from your phone or an authenticator app. It's the layer that protects you even against phishing pages that trick you into typing your password into a fake login form. Prefer an authenticator app or a hardware security key over SMS where it's offered.

Your Privacy on This Page

This generator operates entirely in your browser. Generated passwords are never uploaded, stored remotely, sent to an API, or written to localStorage or sessionStorage. There is no backend for this tool — you can confirm that yourself by checking your browser's network inspector while generating a password.

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Frequently Asked Questions