Random String Generator

Generate random strings using crypto.getRandomValues() with unbiased character selection. Set length and character set in tool settings; optionally enter a count in the input.

  • Runs entirely in your browser
  • No data stored or sent to a server
  • Free forever — no signup
  • Instant conversion

Input and Output

Use the interactive encoder and decoder on this page to process your text.

Learn more about random strings

Generating Secure Random Strings

Random Strings

When to Generate Random Strings

Create cryptographically random strings for test tokens, temporary passwords, nonce values, CSRF secrets, and unique file suffixes. This tool uses crypto.getRandomValues() for entropy.

Real-World Examples

32-character alphanumeric secret for HMAC testing

Short nonce for OAuth state parameter during local dev

Random suffix for temporary S3 object keys

Common Mistakes

  • Using Math.random() for security-sensitive tokens
  • Short strings (under 16 chars) for high-value secrets without assessing collision risk
  • Reusing test secrets in production environments

Developer Tips

  • Set length and character set in Tool Settings before generating
  • For production session IDs, prefer UUID or NanoID tools with documented entropy
  • Node.js: crypto.randomBytes(32).toString('hex')

Frequently asked questions

Is the output cryptographically secure?

Yes. The generator uses crypto.getRandomValues(), which is suitable for test tokens and nonces. Production secrets should still be managed with proper key storage.

Can I customize the character set?

Yes. Tool Settings let you choose length and which character classes to include (uppercase, lowercase, digits, symbols).

How is this different from NanoID?

NanoID uses a fixed URL-safe alphabet and default length. This tool offers flexible length and custom character sets.