API Key Generator

What is a API Key Generator?

An API key generator creates cryptographically secure random tokens suitable for use as API keys, secret tokens, authentication credentials, and session identifiers. API keys are used to authenticate requests from clients to APIs — a server issues a unique key to a client, the client includes the key with every API request, and the server validates the key to confirm the request is from an authorized caller. The security of an API key system depends on the key being impossible to guess — which requires cryptographically secure randomness, not the pseudorandom number generators that most programming languages provide by default. The API Key Generator uses the browser's window.crypto.getRandomValues (the Web Crypto API) to generate random bytes from the operating system's entropy pool, then encodes them in common formats: hexadecimal (64 characters of 0–9 and a–f for a 32-byte key), Base64URL (43 characters, URL-safe for use in query strings and HTTP headers), and UUID v4 format (the standard 8-4-4-4-12 hyphenated format). Generated keys can be used directly as API keys, HMAC secrets, webhook signing secrets, and similar credentials.

How to Use API Key Generator

1. Select your preferred key format: Hex, Base64URL, or UUID from the format selector.
2. Choose the key length (16, 32, or 64 bytes) — 32 bytes (256 bits) is the recommended minimum for API keys.
3. Click ⚡ Generate to create a new cryptographically secure random key instantly.
4. The generated key appears in the output field — review its length and format.
5. Click Copy to copy the key to your clipboard for use in your application or API configuration.
6. Click Generate again to create another completely different key — each uses fresh secure randomness.

Frequently Asked Questions