Symmetric Key Generator

Generate random AES or HMAC keys in hex, Base64, or raw bytes using the Web Crypto API.

Type

Key length

Format

Count

Keys Copied!

Generate a key to see the result.

How It Works

Select a key length (128, 192, or 256 bits) and an output format (hex or Base64). The tool calls the browser's built-in Web Crypto API to generate a cryptographically secure random key and displays it immediately. Each click produces a fresh key; nothing is stored or transmitted.

Use Cases

Generating AES encryption keys for local file encryption
Creating HMAC secrets for signing tokens
Producing one-time keys for test environments
Teaching symmetric cryptography with real key sizes