API Key Generator
Create secure random API keys and tokens with a custom prefix and length — cryptographically random.
Generate secure API keys and tokens
The API Key Generator creates strong, random API keys and tokens with a prefix of your choice (like sk_ or api_) and a custom length. Keys are generated using your browser's cryptographically secure random generator, so they're suitable for real secrets. Generate one or several and copy them individually.
What makes a good API key
A good API key is long, random, and unpredictable. Length is what makes a key resistant to brute-force guessing — 32 characters or more from a large alphabet provides enormous entropy. A prefix (such as sk_live_) is a common convention that makes keys easy to identify in logs and code, and helps tools detect leaked secrets automatically.
How to use it
- Set a prefix (or clear it for none).
- Choose the length and how many to generate.
- Copy the key you want to use.
Why prefixes are useful
| Prefix | Common meaning |
|---|---|
| sk_ | Secret key (server-side only) |
| pk_ | Publishable key (safe for clients) |
| api_ | Generic API key |
Keeping keys secure
A generated key is only as safe as how you store it. Keep secret keys out of client-side code and version control — use environment variables or a secrets manager. Rotate keys periodically and immediately if one is exposed, and scope each key to the minimum permissions it needs. Treat keys like passwords: never share them in plain text.
Security note
This generator runs entirely in your browser and transmits nothing, so the keys are private to you. That said, for production systems many platforms generate keys on the server so they can track and revoke them. Use this tool for development, testing, and self-hosted projects where you control key management.
Private and free
All keys are generated locally — nothing is uploaded or stored. The tool is completely free with no sign-up.
Frequently asked questions
Are these keys cryptographically secure?
Yes. They use your browser's Web Crypto API for secure randomness, suitable for real secrets.
What length should an API key be?
At least 32 characters from a large alphabet for strong entropy. Longer is better for sensitive systems.
What's the prefix for?
It identifies the key's type and purpose in logs and code, and helps automated tools detect leaked secrets.
Is it private?
Yes. Keys are generated entirely in your browser and nothing is uploaded or stored.