API Key Generator | Create Secure API Keys and Secrets

What API Key Generator helps you do

An API key is a machine-oriented credential used to identify a calling application, service, script, or backend integration. Unlike a human password, it is usually generated once, stored safely, rotated deliberately, and sent by software instead of typed by a person.

API keys, client secrets, webhook secrets, bearer tokens, and JWT signing secrets all solve related but different problems. API keys identify callers, JWT tokens carry claims, passwords authenticate people, and OAuth delegates access through a broader authorization flow rather than exposing one long-lived shared credential.

This generator is designed to feel like a real developer utility instead of a basic random-string page. It combines presets, export workflows, entropy analysis, brute-force guidance, and environment-aware prefix options so teams can generate credentials with stronger defaults and better operational habits.

Generator

Presets, secure randomness, exports, and production guidance

Generate API keys, client secrets, session tokens, and similar credentials with presets that set practical defaults while still leaving every option customizable.

Preset Balanced general-purpose keys for server-to-server APIs and private platform integrations. Quantity Generate between 1 and 500 credentials per request. Separator

Key Length Length controls the random body only. Any prefix is added on top and does not increase entropy. Prefix Prefixes are useful for environment labeling, but they are metadata, not security.

Character Mode Predefined modes optimize for transport safety, readability, or compactness.

Custom Character Sets Uppercase letters Lowercase letters Numbers Symbols These checkboxes are used when Custom Character Mix is selected.

Results

Generated Keys Count: 0

Security Information

Entropy, usage guidance, and brute-force perspective

Generate one or more credentials to see entropy, attack-resistance estimates, readiness guidance, and storage recommendations.

Security Best Practices

Never commit API keys, client secrets, or bearer tokens to source control.
Rotate secrets regularly and immediately replace any credential that may have been exposed.
Use different credentials for development, staging, and production environments.
Store secrets in secret managers, environment variables, or dedicated vault systems rather than plaintext files.
Never expose private server-side credentials in browser JavaScript, mobile bundles, or public repositories.
Prefer short-lived tokens, scoped access, rate limits, and monitoring around any high-value credential.

Common Usage Examples

`X-API-Key` header

GET /v1/orders HTTP/1.1
Host: api.example.com
X-API-Key: ath_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

`Authorization: Bearer` header

Authorization: Bearer ath_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Environment variable

API_KEY=ath_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
CLIENT_SECRET=ath_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Configuration file

{
  "Auth": {
    "ApiKey": "ath_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
  }
}

Frequently asked questions

How long should an API key be?

For many production workflows, 32 to 64 random characters can already be strong, but longer secrets are preferred for high-value credentials, long-lived tokens, and signing secrets.

Should API keys contain symbols?

Not always. Symbols increase alphabet size, but many production teams prefer URL-safe or dashboard-friendly formats such as Base58, Base32, Base64Url, or hexadecimal for easier transport and storage.

Can API keys expire?

Yes. Expiring or rotating API keys is often a best practice, especially for temporary environments, contractors, and machine integrations that may outlive their original context.

What is the difference between API keys and OAuth?

API keys identify the calling system directly, while OAuth is an authorization framework that lets users or services delegate scoped access without handing over a long-lived shared secret everywhere.

Should API keys be hashed?

If your system needs to compare a presented key later, hashing stored API keys can be a good practice, much like storing password hashes instead of plaintext secrets.

Can UUIDs be used as API keys?

They can be used as identifiers, but plain UUIDs are often not the best production secret format because purpose-built credentials can provide more entropy, better prefixes, and safer transport-oriented encodings.