Random Hex String Generator
Generate a cryptographically secure random hex string — 16 to 64 bytes, the same output as openssl rand -hex, right in your browser. Free and client-side.
🔒 100% Client-Side Processing
Your data is processed entirely in your browser and never transmitted to any server.
Equivalent to: openssl rand -hex 32
Common Use Cases
API keys and secrets
Services like Stripe, GitHub, and AWS often issue or expect hex-encoded secret keys and tokens. Generate a properly formatted placeholder for local development, .env examples, or documentation without ever exposing a real credential.
Session and auth tokens
Web frameworks such as Express (express-session), Django, and Rails commonly generate session identifiers as random hex strings. Useful for seeding a session store, writing fixtures, or testing session-handling code by hand.
Encryption IVs and nonces
Cipher modes like AES-GCM and AES-CBC require a unique initialization vector or nonce for every encryption operation, typically stored or logged as hex. Pick the byte length your cipher expects — commonly 12 bytes for GCM or 16 bytes for CBC.
CSRF and one-time tokens
Anti-CSRF tokens and one-time-use links are frequently random hex strings embedded in forms or URLs. Generate one to hardcode into a test fixture or manually verify your framework's token validation logic.
Database and request IDs
Some databases and distributed tracing systems use random hex strings as opaque record or trace IDs (the same family as MongoDB ObjectIDs or request-trace IDs). Handy for seeding test data with realistic-looking identifiers.
Command-line alternative
The exact equivalent of running openssl rand -hex N in a terminal — useful when you need a quick token on a machine without OpenSSL installed, or want to generate one from your phone without opening a shell.
Frequently Asked Questions
- How is this the same as openssl rand -hex?
- Identical output format: N random bytes, each printed as two lowercase hex digits. openssl rand -hex 32 and this tool set to 32 bytes produce a 64-character hex string with the same entropy — the only difference is this one runs in your browser instead of a terminal.
- Is the randomness cryptographically secure?
- Yes — it uses the WebCrypto crypto.getRandomValues() API, a cryptographically secure random number generator, the same class of source openssl itself draws from. This is not Math.random(), which is unsuitable for keys or tokens.
- What can I use a random hex string for?
- API keys and secrets, session tokens, encryption keys and IVs, nonces, CSRF tokens, and test fixtures wherever code expects a hex-encoded byte string rather than Base64 or plain alphanumeric text.
- Is my data private when I use this tool?
- Yes. This tool runs entirely in your browser using client-side JavaScript — nothing you type is transmitted to, logged by, or stored on any server. You can safely process confidential text, tokens, or code.