100% Client-Side

Random String Generator

Generate random strings, API keys, and tokens — custom length and charset

Free Client-Side No Login No Storage
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Random Password Generator Generate strong, cryptographically secure passwords — customizable length and charset UUID / GUID Generator Generate UUID v4, v1, and bulk UUIDs — cryptographically secure

How to Use the Random String Generator

  1. Set length, count, and charset (alphanumeric, hex, base64, or custom).
  2. Click Generate.

Uses crypto.getRandomValues() for cryptographically secure random generation. Great for API keys, tokens, and test data.

What is Random String Generation?

The Random String Generator creates cryptographically secure, unpredictable strings and tokens using the browser's native `crypto.getRandomValues()` API. Developers can customize string length, character sets (uppercase, lowercase, digits, symbols), and formatting, making it ideal for API keys, salts, session tokens, and unique test identifiers.

Common Uses

  • Generating high-entropy API secrets, session tokens, and webhook verification keys
  • Creating random database test fixtures and dummy strings for load testing
  • Generating cryptographic salts for custom password hashing implementations
  • Producing unique alphanumeric verification codes and temporary one-time passwords

Frequently Asked Questions

Is this generator cryptographically secure (CSPRNG)?

Yes. The tool uses `window.crypto.getRandomValues()`, which draws high-entropy randomness directly from your operating system's cryptographic random pool, unlike predictable `Math.random()`.

Can I exclude ambiguous characters like 'O' and '0' or 'l' and '1'?

Yes. You can toggle character set presets or exclude confusing characters that look visually identical to avoid user transcription errors.

Are the generated strings stored or logged?

No. Once generated on your screen, the strings exist solely in your browser's volatile memory and disappear when the page is refreshed.

Notes from this implementation

Not a password, unless you meant it to be

This page builds a string of a given length from a given alphabet. Use it for fixture ids, coupon-shaped codes, and test data. If the alphabet is only digits, say so in the note you keep next to the value: a 6-digit string is a million possibilities, which is fine for a short-lived UI code and useless as an account secret.

The password generator is the page that talks about character classes and managers. This one will not add a hyphen or a checksum unless you asked for that pattern. If you need a UUID, use the UUID page so the version nibble is set correctly instead of being an accident of a random hex string.