API Key Generator
Create secure random API keys and tokens right here in your browser. Choose a format, set the length, add your own prefix, and copy the results. Every key is generated with crypto.getRandomValues — the browser’s cryptographically secure random source — and nothing ever leaves your device.
Random hex string — e.g. 6f3a9c21...
Added to the start of every key.
Approximate entropy: 128 bits
Character sets (used by alphanumeric formats)
How to use
- Pick a key format — hex, Base64URL, UUID v4, segmented alphanumeric, or Stripe-style.
- Set the random length (16 to 128 characters) and how many keys to make (1 to 20).
- Optionally add a custom prefix, and choose the character sets for alphanumeric formats.
- Press Generate keys, then copy individual keys with their copy buttons or all at once with Copy all.
Note: Keys are made with crypto.getRandomValues from the Web Crypto API — a cryptographically secure random generator — so they are safe for development tokens and API keys. They are created and stored only in your browser. For production, always store keys securely and rotate them if they are ever exposed.