Random String Generator uses the browser's cryptographically secure random algorithm (crypto.getRandomValues) to generate truly random strings. Customize string length, choose character types (uppercase, lowercase, numbers, symbols), or use a custom character set. Built-in presets for passwords, tokens, and hex strings with batch generation support.
Cryptographically Secure Randomness
This tool uses the Web Crypto API's getRandomValues method, generating cryptographic-grade secure random numbers, unlike Math.random() pseudo-random numbers. Generated strings are suitable for security-sensitive applications like passwords, keys, and tokens.
String Strength Recommendations
- Passwords: 16+ characters with mixed case + numbers + symbols
- API Tokens: 32+ alphanumeric characters for URL safety
- OTP/Verification codes: 6 digits, short-lived validity
- Session IDs: 32-character hexadecimal strings
Preset Modes Explained
Password mode uses full character set for maximum strength; Token mode uses alphanumeric for URL-safe transmission; Hexadecimal mode generates standard hex strings; Numeric mode is ideal for verification codes.
FAQ
Q: Is the generated randomness secure?
A: Yes. It uses the Web Crypto API, generating cryptographically secure random numbers that meet cryptographic requirements. All computation happens locally in your browser - strings are never uploaded to any server.
Q: How to generate UUID format strings?
A: UUID format is 8-4-4-4-12 hexadecimal string. Select hexadecimal preset, generate 32 characters, then add hyphens manually, or use a dedicated UUID generator tool.
Q: How many strings can I generate at once?
A: Supports generating 1-100 strings at once, each 1-256 characters long. After batch generation, copy all results with one click, separated by newlines.