Generators

Random String Generator

Generate cryptographically secure random strings for API keys, tokens, passwords, or any use case requiring unpredictable output. Configure the length, character set (lowercase, uppercase, digits, symbols), and quantity. Uses crypto.getRandomValues() for cryptographically secure randomness — not Math.random().

Random String Generator — Generate cryptographically random strings and passwords

What it does

  • ▸Generates cryptographically secure random strings using crypto.getRandomValues()
  • ▸Configurable length (1 to 10,000 characters)
  • ▸Character set options: lowercase, uppercase, digits, symbols, custom
  • ▸Bulk generation — create multiple strings at once
  • ▸Exclude ambiguous characters (0, O, l, 1, I) for human-readable codes

Use cases

  • ▸Generating API keys and secret tokens for authentication
  • ▸Creating random passwords with specific character requirements
  • ▸Generating verification codes or coupon codes
  • ▸Creating random IDs for test data or temporary resources

How it works

1

Set the string length and select the character sets to include

2

Optionally exclude ambiguous characters for readability

3

Set the quantity if you need multiple strings

4

The generated strings appear in the output pane

Frequently asked questions

1Are these strings cryptographically secure?

Yes. The generator uses crypto.getRandomValues(), which provides cryptographically secure random numbers from the operating system's entropy source. The output is suitable for API keys, session tokens, and other security-sensitive uses.

2What's the 'exclude ambiguous characters' option?

When enabled, the generator skips characters that look similar: 0 (zero) vs O (letter), 1 (one) vs l (lowercase L) vs I (uppercase i). This makes the strings easier to read and type, which is useful for verification codes or manual entry.

3How long should my API key be?

For most applications, 32 characters (about 190 bits of entropy with a 62-character alphabet) is sufficient. For high-security applications, use 64 characters or more. The tool shows the entropy in bits so you can assess the strength.

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