How to use the Random String Generator
1. Set the string length and choose which character types to include.
2. Optionally enter a custom character set to use only specific characters.
3. Set how many strings to generate (1–100) and click Generate.
4. Copy all results at once or individually.
What is it?
Random strings are used extensively in software development: API keys, session tokens, nonces, one-time codes, test data, and unique identifiers. This generator uses the Web Crypto API for cryptographically secure randomness.
The custom character set option lets you generate strings for specific use cases: only hex characters (0-9a-f) for color codes, only alphanumeric for URL slugs, or any custom set. Bulk generation is useful for creating large sets of test data or seeding databases.
Example
— click Generate —
k9mXpR3qwJtBvN8hYzC5eLfA2dG1sUoi M7nTyK4aWjH6bEcP0xQrV9gZlDs3uFiO
Uses crypto.getRandomValues() — cryptographically secure and suitable for API keys and tokens.
Benefits
Generate API keys, session tokens, and nonces of any length
Cryptographically random strings from the Web Crypto API serve as secure ephemeral credentials, tokens, and one-time values.
Create unique filenames for uploads and temporary files
Random strings prevent filename collisions and make file paths harder to guess or enumerate for unauthenticated access.
Generate test strings with specific character set constraints
Include or exclude character classes to create test inputs that validate your application's character filtering and input handling.
Produce short random identifiers for A/B experiments and feature flags
Short random alphanumeric strings are a common format for experiment IDs, flag keys, and feature assignment identifiers.
Frequently asked questions
Is this cryptographically secure?
Yes. We use crypto.getRandomValues() which provides cryptographically secure pseudorandom numbers, suitable for security tokens and API keys.
What is a custom character set?
If you enter custom characters (e.g., 'abc123'), only those exact characters will be used. This overrides the checkbox selections.