API Key Generator
Generate cryptographically secure API keys instantly in your browser. Choose bit length, character type, prefix, and separator — no server, no uploads
CODE
Strength
Generated using crypto.getRandomValues — cryptographically secure, entirely in your browser.
Runs 100% Locally in Your Browser
This tool processes your data entirely on your device. Nothing is uploaded, stored, or sent to any server.
No Uploads
Privacy First
Secure by Default
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Frequently Asked Questions
How are the API keys generated?
Keys are generated using crypto.getRandomValues — the browser's cryptographically secure random number generator — so they are suitable for real-world use.
What is the difference between hex and alphanumeric API keys?
Hex keys use characters 0–9 and a–f (16 possible values per character); alphanumeric keys use 0–9, a–z, and A–Z (62 possible values), giving more entropy per character for the same length.
What bit length should I choose for an API key?
128-bit provides good security for most APIs. 256-bit is the most common production standard. 512-bit is overkill for typical use but available for maximum security requirements.
What does the prefix option do?
A prefix is a fixed string prepended to every generated key, e.g. 'sk_live_'. This is a common pattern used by services like Stripe and OpenAI to identify the key type at a glance.
Are my generated API keys stored or logged anywhere?
No. Generation runs entirely in your browser — keys are never transmitted, stored, or sent to any server.
Can I generate multiple API keys at once?
Yes. Set the count to any number up to 500 and all keys are generated and displayed in one click.