API Key Generator
Generate secure, random API keys with an optional prefix and configurable length.
Frequently Asked Questions
Is this API key generator secure?
Yes. Keys are generated using the Web Crypto API (crypto.getRandomValues), which produces cryptographically secure random values in your browser. No data is sent to any server.
What characters are included in the generated key?
The key body uses uppercase letters (A–Z), lowercase letters (a–z), and digits (0–9) — 62 possible characters per position. The prefix is whatever you type, separated by an underscore.
How long should my API key be?
32 characters (about 190 bits of entropy from a 62-character alphabet) is sufficient for virtually all use cases. Use 64+ characters for extra security in high-value contexts.
What prefix should I use?
Common conventions: sk_ for secret keys, pk_ for public keys, prod_ or dev_ to indicate environment, or your app name as a short abbreviation. The prefix is optional and does not affect security.
API Key Generator — Create Secure Random Keys Instantly
API keys are the most common credential format for authenticating requests to web services, SDKs, and internal tools. A strong API key should be long, random, and unique — and generating one by hand is error-prone and insecure.
This tool uses the browser's built-in cryptographic random number generator (Web Crypto API) to produce keys from a mix of uppercase letters, lowercase letters, and digits. Because every character is drawn from 62 possibilities using truly random values, the output has the entropy needed for production use.
You can add an optional prefix — like sk_, pk_, or prod_ — to make keys self-describing at a glance, a pattern popularized by Stripe, OpenAI, and other well-known APIs. The key length is fully configurable from 8 up to 256 characters; 32–64 characters is typical for most use cases.
How to Use the API Key Generator
- Optionally enter a prefix (e.g. sk, pk, prod) — it will be prepended with an underscore.
- Set the desired key length using the input field or the quick-select buttons (16, 32, 64, 128).
- Click "Generate API Key" to create a cryptographically random key.
- Click "Copy" to copy the key to your clipboard.
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