API Key Generator

Your data never leaves your browser

Generate API-key-style strings with an optional prefix and custom length.

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About API Key Generator

Generate cryptographically secure API keys using your browser's crypto.getRandomValues API. Customize the prefix (e.g. sk_, pk_, api_), key length, and how many keys to generate. Perfect for development, testing, and bootstrapping new services.

How to use

  1. Set an optional prefix (e.g. sk_, pk_, api_).
  2. Set the key length (random alphanumeric characters after the prefix).
  3. Set how many keys to generate.
  4. Click Generate to produce the API keys.

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Frequently Asked Questions

FAQs about API Key Generator

What characters are used in the key?

API keys use alphanumeric characters only (A–Z, a–z, 0–9) for maximum compatibility with headers, query parameters, and storage systems.

Is the output cryptographically secure?

Yes. Keys are generated using crypto.getRandomValues(), a cryptographically secure RNG built into your browser.

What prefix should I use?

Common conventions: sk_ for secret keys, pk_ for public keys, api_ for generic API keys. Stripe uses sk_live_, sk_test_, pk_live_, pk_test_. Use whatever fits your naming convention.

Is my data sent to a server?

No. All generation happens entirely in your browser. Nothing is transmitted or stored.

Can I generate multiple API keys at once?

Yes. Set the Count option to generate up to 50 keys at once.