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Password Generator Online — Strong Random Passwords Free

Generate strong random passwords in your browser using a cryptographically secure source of randomness. Choose the length, allowed character sets, and rules — exclude ambiguous characters, require at least one of each class, or produce memorable passphrases. Nothing is uploaded or logged, so the passwords you copy are seen only by you.

Features

  • Cryptographically secure

    Uses the browser's `crypto.getRandomValues` — the same source used for TLS keys.

  • Flexible character sets

    Toggle uppercase, lowercase, digits, and symbols; exclude lookalikes like `0`/`O` and `1`/`l`/`I`.

  • Memorable passphrases

    Generate word-based passphrases (e.g. `correct-horse-battery-staple`) for high entropy without unreadable strings.

  • Bulk generate

    Generate up to dozens of passwords at once for credential rotation or seeding test environments.

How to generate a strong password online

Produce a secure random password in four steps.

  1. Choose lengthPick a length — 16+ for general use, 20+ for high-value accounts.
  2. Toggle character classesEnable uppercase, lowercase, digits, and symbols. Disable ambiguous lookalikes if you plan to type the password.
  3. GenerateClick Generate — a new password is computed using the browser's secure RNG.
  4. Copy securelyUse the copy button. Paste it directly into your password manager — don't leave it visible.

Examples

Strong general-purpose password

Input
length=20, all classes, no ambiguous
Output
j4Z!u8x@WkmN3D2QnYpS

Memorable passphrase

Input
4 words, hyphen-separated
Output
crystal-orbit-pepper-flux

Easier to type, still ~50 bits of entropy with a 5,000-word list.

Frequently Asked Questions

Is this random number generator secure?
Yes. The tool uses `crypto.getRandomValues`, the cryptographically secure random source built into every modern browser. The output is suitable for passwords, tokens, and other security-sensitive uses.
How long should my password be?
For modern web accounts, 16–20 characters with mixed classes is comfortable and strong. For high-value accounts (banking, master passwords), use 24+ characters or a long passphrase.
Are the passwords stored or sent anywhere?
No. Generation happens locally in your browser, and the result is held only in memory. Once you close the tab, nothing remains.
What is a passphrase?
A passphrase is a sequence of random words separated by spaces or hyphens — easier to remember than a random string while still high entropy. The Diceware approach inspired this style of password.
Should I use the same password everywhere?
No. Use a password manager and generate a unique password for every site. If one site is breached, your other accounts remain safe.
Why exclude ambiguous characters?
On some fonts, `0` and `O`, `1` and `l`/`I`, `5` and `S` look similar. Excluding them helps when you have to read or type the password manually — at the cost of slightly less entropy per character.