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.