Random Key Generator

Generate cryptographically secure random keys instantly using Web Crypto API—equivalent to running openssl rand -base64 32 on the command line. Create Base64, hexadecimal, URL-safe, or alphanumeric tokens with customizable strength (128-bit to 512-bit). Perfect for JWT secrets, API keys, encryption keys, and session tokens. All generation happens in your browser—nothing is sent to any server.

Cryptographically Secure: Using Web Crypto API (equivalent to openssl rand)

GENERATED KEYS

256-bit•44 chars

# Equivalent command:

openssl rand -base64 32

OPTIONS

Output Format

Standard Base64 encoding (A-Z, a-z, 0-9, +, /)

Key Strength

Quantity

Keys to generate (1-100)

Cryptographically Secure Random Key Generator

This tool generates cryptographically secure random keys using the Web Crypto API, equivalent to running openssl rand -base64 32 on the command line. Unlike standard random number generators, this uses your operating system's cryptographic random number generator (CSPRNG) to produce unpredictable, secure values.

All key generation happens entirely in your browser—nothing is sent to any server. The generated keys are suitable for API secrets, encryption keys, JWT secrets, session tokens, and other security-sensitive applications.

Key Format Comparison

Format	Characters	Length (32 bytes)	Best For
Base64	A-Z, a-z, 0-9, +, /, =	44 chars	Config files, environment variables
Hexadecimal	0-9, a-f	64 chars	Encryption keys, database tokens
URL-Safe Base64	A-Z, a-z, 0-9, -, _	43 chars	URLs, API tokens, JWTs
Alphanumeric	A-Z, a-z, 0-9	32 chars	Readable codes, user-facing tokens

Common Use Cases

🔐

JWT Secrets

Generate 256-bit secrets for signing JSON Web Tokens in authentication systems. Use Base64 format for easy storage in environment variables.

🗝️

API Keys

Create secure API keys for service authentication. URL-safe Base64 works well for keys that may appear in query strings.

🔑

Encryption Keys

Generate AES-256 encryption keys (32 bytes) or AES-128 keys (16 bytes). Hex format is commonly used for key derivation functions.

🍪

Session Secrets

Secure cookies and session management with strong secrets. Frameworks like Express, Django, and Rails require these for session signing.

🛡️

CSRF Tokens

Generate per-request CSRF protection tokens. Alphanumeric format works well for embedding in hidden form fields.

🔗

Webhook Secrets

Create secrets for webhook signature verification. GitHub, Stripe, and other services use HMAC signatures with secrets like these.

Generate Secure Keys in Code

Programmatic alternatives to this tool in popular languages and frameworks.

Node.js

// Cryptographically secure

const crypto = require('crypto')

// Base64 (like openssl rand -base64 32)

const base64Key = crypto

.randomBytes(32)

.toString('base64')

// Hex (like openssl rand -hex 32)

const hexKey = crypto

.randomBytes(32)

.toString('hex')

Python

# Using secrets module (Python 3.6+)

import secrets

import base64

# Base64 key

key = base64.b64encode(

secrets.token_bytes(32)

).decode()

# Hex key

hex_key = secrets.token_hex(32)

PHP

// PHP 7+ secure random

// Base64 key

$base64Key = base64_encode(

random_bytes(32)

);

// Hex key

$hexKey = bin2hex(

random_bytes(32)

);

Command Line (OpenSSL)

# Generate random keys

# 32-byte Base64 key

openssl rand -base64 32

# 32-byte Hex key (64 chars)

openssl rand -hex 32

# URL-safe Base64

openssl rand -base64 32 | \

tr '+/' '-_' | tr -d '='

Security Best Practices

✅

Use 256-bit Keys

32 bytes provides 256-bit security, considered unbreakable with current technology for symmetric encryption

🔒

Store Secrets Securely

Use environment variables or secret managers (AWS Secrets Manager, Vault) rather than hardcoding in source code

🔄

Rotate Keys Regularly

Implement key rotation policies to limit exposure if a key is compromised

🚫

Never Commit Secrets

Add secret files to .gitignore and use pre-commit hooks to prevent accidental exposure

📊

Use CSPRNG Only

Always use cryptographically secure random number generators, never Math.random() or similar

🎯

Right Size for Purpose

AES-128 needs 16 bytes, AES-256 needs 32 bytes—match key length to algorithm requirements

Frequently Asked Questions

Is this as secure as openssl rand?

Yes. The Web Crypto API uses your operating system's CSPRNG (Cryptographically Secure Pseudo-Random Number Generator), which is the same source OpenSSL uses. On Linux it uses /dev/urandom, on Windows CryptGenRandom, and on macOS SecRandomCopyBytes.

Are the generated keys stored anywhere?

No. All key generation happens entirely in your browser using JavaScript. Nothing is transmitted to any server, and keys are not stored in cookies, localStorage, or any persistent storage. Each page refresh generates new keys.

What key length should I use?

For most purposes, 32 bytes (256 bits) is recommended. This provides excellent security for JWT secrets, encryption keys, and API tokens. Use 16 bytes for AES-128 or 64 bytes for extra-long tokens.

Which format should I choose?

Use Base64 for environment variables and config files (compact). Use Hex for cryptographic applications (easy to parse). Use URL-safe Base64 for tokens in URLs or JWTs. Use Alphanumeric for human-readable codes.

Why does HTTPS matter for this tool?

The Web Crypto API only works in "secure contexts" (HTTPS or localhost). Without HTTPS, the tool falls back to Math.random() which is NOT cryptographically secure and should not be used for security purposes.

Can I use this for password generation?

While technically secure, these keys aren't designed for human-memorable passwords. For passwords, consider a dedicated password manager or generator that balances security with memorability using passphrases.

Please, do let us know and we'll see what we can do for you.