API Key Generator — Free Online Secure Random API Key Generator
Generate cryptographically secure random API keys in hex, Base64URL, alphanumeric, or UUID format — 100% client-side using Web Crypto API.
Jump to tool ↓Frequently Asked Questions
Secure API Key Generation
API keys are credentials that authenticate requests to your API. A well-generated API key must have sufficient entropy (randomness) to resist brute force and guessing attacks. Using Math.random() or timestamp-based keys is a critical security vulnerability — always use a cryptographically secure random number generator.
This tool uses crypto.getRandomValues() from the Web Crypto API — the same source of randomness used by TLS key generation and secure token creation. On modern platforms this uses hardware entropy from the operating system.
For typical API authentication, 32 bytes (256 bits) of random data provides excellent security. Encoded as hex, this gives you a 64-character key. As Base64URL, it is 43 characters. Both are common formats used by real API providers like Stripe (sk_live_...), GitHub (gh_...), and AWS.
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