API Key Generator
Generate secure random API keys, tokens, and secrets. Choose length, format, and prefix instantly.
About This Free Online API Key Generator
Our free online API key generator creates secure, random keys, tokens, and secrets using your browser's cryptographic random number generator. Choose the length, output format (hexadecimal, alphanumeric base62, or UUID), and an optional prefix like sk_ or pk_. Generate one key or a batch at once. Because keys are generated locally with crypto.getRandomValues, they never touch a server. Perfect for developers creating API keys, session secrets, and access tokens.
Features of Our API Key Generator
- Cryptographically secure random generation
- Hex, alphanumeric (base62), or UUID formats
- Custom length and optional prefix
- Generate single keys or batches
- One-click copy
- 100% private — keys never leave your browser
How to Use the API Key Generator
Using this tool is simple and requires no signup or registration. Follow these steps:
- Choose the output format: hex, alphanumeric, or UUID.
- Set the key length and an optional prefix.
- Click Generate to create one or more keys.
- Copy your key — it was generated locally and never sent anywhere.
Frequently Asked Questions About API Key Generator
Are these API keys secure?
Yes. Keys are generated with the browser's crypto.getRandomValues, a cryptographically secure random source. They are created entirely on your device and never transmitted, logged, or stored.
What format should I use?
Hex and base62 alphanumeric are common for API keys and tokens; UUID is ideal when you need a standardized 128-bit identifier. Add a prefix like sk_ or pk_ to label key types, as many APIs do.
How long should an API key be?
For strong security, 32 characters or more of random hex or base62 is typical. Longer keys are harder to brute-force. This tool defaults to a secure length you can adjust.
Why Choose Text Toolbox?
Text Toolbox provides free, private, and instant online text tools. Unlike other text utility websites that require signup accounts or send your data to servers, all our tools process your text entirely in your browser. This means your content never leaves your device — we cannot see it, store it, or share it. Our tools are fast, lightweight, and work on any device with a modern web browser.