API Key & Secret Generator – Secure Random Strings

A secure API key is randomly generated with high entropy (at least 128 bits) and uses a wide character set. Our generator uses the cryptographic random number generator to ensure unpredictability. Avoid using predictable words, dates, or patterns.

It depends on the character set. For alphanumeric keys (62 characters), a length of 32 gives about 190 bits of entropy — more than sufficient for most applications. We recommend at least 20 characters for basic usage and 40+ for high-security environments.

Special characters increase the character pool and entropy, but they can cause issues in URLs, headers, or when stored in some systems. For APIs, alphanumeric (a-z, A-Z, 0-9) is generally safe and widely supported. If you need extra security, include symbols and URL-encode when necessary.

An API key often identifies the client or project (like a username), while a secret is used for authentication (like a password). In many OAuth flows, you generate both a client ID (key) and a client secret. This tool can generate either, and you can adjust settings to match your provider's requirements.

Never hardcode keys in your source code. Use environment variables, a secrets manager (like HashiCorp Vault, AWS Secrets Manager), or encrypted configuration files. Always restrict access and rotate keys regularly.

While collisions are extremely unlikely with high entropy, this tool does not check for duplicates across generations. If you need absolute uniqueness, combine the generated string with a timestamp or use a UUID-based approach. For most practical purposes, a 32‑character random string from a 62‑character set provides ~5×10⁵⁷ possible combinations — virtually no chance of duplication.