What does this tool do?
API Key Generator creates unpredictable API keys using your browser's secure randomness source (crypto.getRandomValues). It's ideal for developers, teams spinning up test environments, and anyone who needs a placeholder or mock key on the fly.
How to use it
- Choose the required options or length.
- Generate the secure result.
- Copy and store the result safely.
Shape the key to match your service
Choose any length from 8 to 128 characters and pick a character set: hex, Base62, alphanumeric, or numeric only. Add a prefix like 'sk' and the key is produced as sk_xxxx, mirroring conventions used by services such as Stripe or OpenAI. You can generate up to 20 keys at once and copy each individually, making it quick to prepare values for multiple environments like dev, staging, and prod.
Why browser-side generation is safe
Keys are generated with the cryptographically secure crypto.getRandomValues rather than a predictable source like Math.random. Everything runs on your device, and generated values are never sent to or stored on any server. For real production secrets, server-side generation and a secrets vault are still recommended; this tool is a practical choice for prototypes, tests, and placeholder scenarios.
Frequently asked questions
What's the difference between hex, Base62, and alphanumeric?
Hex uses only 0-9 and a-f (16 symbols), so it produces longer but fully safe IDs. Base62 and alphanumeric include upper- and lowercase letters plus digits, giving higher entropy at the same length. Numeric uses digits only.
What does the prefix do?
The prefix prepends a label like sk_ to the key. This makes it easy to distinguish key types or environments, for example sk_ for secret keys and pk_ for public keys.
Could the same key be generated twice?
In practice, no. Even a 32-character hex key has an astronomically low collision probability because each character is chosen independently using cryptographic randomness.
Is API Key Generator free?
Yes. API Key Generator and all 300+ tools on MagmaNex are completely free with no signup or account required.
Is my data safe?
Yes. Everything runs locally in your browser. The data you enter is never sent to a server, stored, or shared.
Does it work on mobile?
Yes. API Key Generator works on phones, tablets and desktops — no app download needed.
🔒 Privacy: everything runs in your browser, your data is never sent to a server.