API Key Generator
Generate secure, high-entropy API keys using the Web Crypto API. Support for Stripe-style prefixes, Base62 encoding, and bulk generation — all 100% locally in your browser.
How ZeroData protects your privacy
- ✓ No Uploads: Processing happens entirely via client-side JavaScript.
- ✓ No Storage: We do not have a database. We physically cannot save your data.
- ✓ No Tracking: We don't log what you process or track your inputs.
- ✓ Verifiable: Check your DevTools Network tab. You will see 0 outbound requests.
Why Use a Dedicated API Key Generator?
Generating random strings for API keys might seem simple, but doing it securely requires cryptographically secure random number generators (CSPRNG). Standard utility functions like Math.random() are predictable and should never be used for security tokens. Our generator exclusively uses the browser's crypto.getRandomValues() API to ensure true randomness and high entropy.
The Power of Prefix-Based API Keys
If you look at modern API platforms like Stripe, GitHub, or Slack, their API keys always start with a prefix (e.g., sk_live_ or ghp_). This is a best practice for two main reasons:
- Developer Experience: It's immediately obvious what the key is for and which environment it belongs to (test vs. production).
- Secret Scanning: Automated security tools (like GitHub Advanced Security) can use regular expressions to easily detect leaked keys if they follow a known prefix pattern, allowing them to instantly revoke the compromised key.
Privacy and Security First
Your API keys are the keys to your infrastructure. You should never generate them using an online tool that sends the keys back to a server. Our API Key Generator is a purely client-side application. The JavaScript runs in your local browser, generates the keys using local APIs, and never transmits them over the internet.
Common Use Cases
- Generating secure API keys for a new SaaS application.
- Creating long-lived service account tokens for microservices communication.
- Generating encryption keys or HMAC secrets for signing webhooks.
- Creating identifiable, prefix-based tokens (e.g., 'myapp_test_...') for developers.
- Generating high-entropy nonces or salts for cryptographic operations.
Frequently Asked Questions
What makes a good API key?
A good API key should be completely random (high entropy), long enough to prevent brute-force attacks (at least 256 bits or 32 bytes of entropy), and safely encoded (like Base62 or Base64URL) so it can be passed in HTTP headers without issues.
Why should I use a prefix like 'sk_live_'?
Prefixes help you and automated tools instantly identify what an API key is for. For example, GitHub secret scanners can detect leaked keys faster if they have a known prefix. Stripe famously uses prefixes like 'sk_live_' and 'pk_test_' to differentiate secret vs. publishable keys and environments.
Is it safe to generate API keys in the browser?
Yes, our tool uses the Web Crypto API (crypto.getRandomValues) which provides cryptographically secure pseudorandom numbers. Since the generation happens 100% locally in your browser, the keys are never transmitted over the network or saved to any server.
What is the difference between Base64 and Base64URL encoding?
Standard Base64 includes the '+' and '/' characters, which have special meanings in URLs and can cause parsing issues. Base64URL replaces '+' with '-' and '/' with '_', and usually strips the '=' padding, making the resulting string safe to use in URLs and HTTP headers.
How many bits of entropy do I need?
For API keys and session tokens, 256 bits (32 bytes) of entropy is the industry standard recommendation. This is virtually impossible to brute-force or guess using modern computing power.
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