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Strong Password Generator

Generate strong, random passwords using crypto.getRandomValues. Configure length (4 to 256), batch count (1 to 100), and which character classes to include: uppercase, lowercase, digits, symbols. Optional ambiguous-character exclusion (Il1O0o) for cases where the password will be read or typed manually. When you need stable IDs instead of secrets, switch to the UUID v4 Generator, or use the SHA Hash Generator to fingerprint a derived value.

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How it works

We assemble a character pool from your selected sets, optionally remove visually ambiguous characters, then for each character of the password we pull a uniform random index from crypto.getRandomValues. This is significantly more secure than Math.random.

How to use it

  1. Pick the length

    Choose between 8 and 128 characters. 16 is a sensible floor for human accounts, 32 or more for service tokens.

  2. Pick the character sets

    Toggle uppercase, lowercase, digits and symbols. Exclude ambiguous characters when the password will be retyped on a phone.

  3. Generate via Web Crypto

    crypto.getRandomValues produces cryptographically random bytes in your browser. No counter, no seed, no log.

  4. Copy and store safely

    Copy the password into your password manager. Do not leave it in clipboard history. Generate a fresh one for the next account.

Use cases

Create credentials for a new account or service.

Pre-generate a batch of API keys for service accounts.

Build memorable passwords for a workshop demo.

Generate unique passwords without repeating manual ideas.

When NOT to use it

  • For deriving cryptographic keys from a passphrase. Use Argon2, scrypt or PBKDF2 server-side instead.
  • As a session token or API token directly. Use crypto.randomUUID() or a 32-byte CSPRNG nonce.
  • When the password will be entered by hand on a phone keyboard. Excluding ambiguous characters helps but a passphrase tool is still a better fit.

Your data never leaves your browser

Every utility runs entirely on your device. Nothing is uploaded, nothing is stored on a server. You can disconnect from the internet and they keep working.

Frequently asked questions

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