Random String Generator
Generate cryptographically secure random strings with configurable character sets and length.
The Random String Generator uses the Web Cryptography API (crypto.getRandomValues) to produce cryptographically secure strings suitable for tokens, passwords, session IDs, and test data. Select any combination of character sets, set your desired length, and generate up to 20 strings at once.
Frequently Asked Questions
Are the strings cryptographically secure? +
Yes — randomness is sourced from crypto.getRandomValues(), which uses the browser's CSPRNG (Cryptographically Secure Pseudo-Random Number Generator), not Math.random(). This makes them suitable for security-sensitive use cases.
What are URL-safe characters? +
The URL-safe option adds hyphen (-) and underscore (_) to the character pool. These characters do not need to be percent-encoded in URLs, making the resulting strings safe to use in query parameters, paths, and JWT tokens.
Is any data saved or transmitted? +
No — all generation happens client-side. The strings exist only in your browser's memory and are never sent to any server.
Frequently Asked Questions
- Uppercase letters (A-Z), lowercase letters (a-z), digits (0-9), and symbols. Mix and match any combination.