Use the free API Key Generator below: your data never leaves your browser — all work happens on your device, and nothing is uploaded to any server.
API keys: the passwords machines use
An API key is a secret string that identifies a program calling an API. When your code talks to a payment provider, a maps service or an AI model, it sends an API key with the request, and the provider checks that the key is valid and has permission. The key is the program’s password. Like a human password, it must be long, random and kept secret, because anyone who holds it can use the service as if they were you, and run up your bill.
Real API keys usually have a recognizable shape. Many start with a prefix that says what they are, like “sk-live-” for a live secret key or “sk-test-” for a test key, followed by a long random string. The prefix helps humans and tools recognize the key and route it correctly, and it helps scanners find leaked keys in code. The random part is what provides the security. A key with 32 random characters from letters and digits has about 190 bits of entropy, which is far beyond brute force. Shorter keys, or keys made from words and patterns, are much weaker.
How this tool generates keys
You choose a prefix, a length, a character set and a count, and the tool generates keys with your browser’s cryptographic random generator, the same source your browser uses for secure connections. It uses rejection sampling, so every character in the chosen set is equally likely, with no bias toward any character. It shows the approximate entropy of each key, so you can see how the length and character set translate into security. And it stores nothing: the keys exist only on this page until you copy them, and nothing is sent to any server.
The character sets matter. Letters plus digits give 62 characters, which is a good default. Hex gives only 16 characters, so it needs a longer key for the same strength. Adding symbols raises the alphabet to 72 characters, which adds a little entropy per character, but symbols can cause trouble in URLs, shell commands and configuration files, so many real providers stick to letters and digits. The tool lets you choose, because the right answer depends on where the key will be used.
Storing and handling keys safely
The most common API key disaster is committing a key to a public code repository. Scanners find leaked keys within minutes, and attackers use them immediately. Never put a real key in code, in a screenshot, in a chat message or in a client-side web page. Store keys in environment variables or a secrets manager, load them at runtime, and keep them out of version control. If a key leaks, revoke it at once and issue a new one, because you cannot un-leak a string that has been copied.
Separate your keys by environment. Test keys should be useless in production, and production keys should never appear in test code or logs. Rotate keys on a schedule and whenever someone with access leaves. Give each integration its own key, so that revoking one does not break everything else, and so that you can tell from usage logs which integration is responsible for which traffic. These habits matter more than the exact length of the key, because most key compromises come from handling mistakes, not from cryptanalysis.
Prefixes, and why they exist
Prefixes like “sk-live-” look cosmetic, but they do real work. They let a human instantly see whether a key is live or test, which prevents the classic mistake of testing against production. They let automated scanners detect keys in code and warn you. And they let a provider change key formats over time while keeping old keys recognizable. Some providers also encode the key’s purpose or region in the prefix. When you generate keys for your own service, adopting a clear prefix convention is cheap and pays off the first time someone pastes the wrong key into the wrong place.
Remember that a generated key from this tool is a random string, not a registered credential. It becomes a real API key only when a service issues it or you store it as one in your own system. Use this tool to create keys for your own projects, for testing, and for learning, and always follow your provider’s own key management when working with a real service.
Common questions
How long should an API key be? At least 32 random characters from letters and digits, which gives about 190 bits of entropy. Should I use symbols? Only if your system handles them safely; letters and digits are enough at a good length. Are generated keys stored anywhere? No. They are generated in your browser and never leave the page. Can I use these keys with a real provider? Only if you register them with that provider; a random string alone is not an account.
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