Free online API key generator using crypto.getRandomValues CSPRNG for truly random, cryptographically secure API keys and access tokens. Customize prefix (e.g. sk-, pk_), key length 8-128 characters, character sets (hex/alpha/alphanumeric/full), batch generate 1-50 keys. One-click copy and TXT export. 100% client-side β keys never leave your browser.
CSPRNG Β· Zero Dependencies Β· Works OfflineβοΈ Key Configuration
π FAQ
What is an API key and what is it used for?
An API key is a unique identifier used to authenticate and authorize applications calling API interfaces. It acts as a digital key controlling access to API resources. Common uses include OpenAI API (ChatGPT), Stripe payments, Google Maps, AWS cloud services, and Twilio messaging.
Are the generated API keys secure?
Absolutely. This tool uses the browser's built-in crypto.getRandomValues() CSPRNG for true cryptographic randomness β not Math.random(). All generation happens locally in your browser. Keys never travel over the network or get uploaded to any server. You can disconnect from the internet and it still works.
Which character set should I choose?
Alphanumeric (default) works for most APIs like OpenAI's sk- format. Hexadecimal is best for UUID-style compatibility or legacy systems. Letters-only is easiest to read and type manually. Full charset (with special characters) offers maximum security but some APIs may not support special characters. When in doubt, use the default alphanumeric.
What key length is recommended?
32+ characters is recommended. OpenAI uses sk- prefix + 48 chars, Stripe uses sk_live_ + 24 chars, GitHub uses ghp_ + 40 chars. For high-security scenarios (payment gateways), 64-128 chars is advised. Longer keys are more secure, but ensure your target API accepts the length.
What is the prefix for?
Prefixes help identify key types at a glance: sk- for Secret Keys (never share publicly), pk- for Public Keys, sk_live_ for production environment keys. Prefixes don't affect security but significantly improve key management and rotation workflows.
How to Use the API Key Generator
- Configure Parameters
Set key length (8-128), number of keys (1-50), optional prefix (e.g. sk-), and character set. All parameters take effect instantly. - Click Generate
Click "Generate Keys" β the tool uses crypto.getRandomValues CSPRNG to create keys locally in your browser. No server round-trip needed. - Copy or Export
Click the copy button next to any key, use "Copy All" for batch copying, or "Download TXT" to save all keys as a text file. Unlimited generations with no restrictions.