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API Key Generator

Generate highly secure, random, and custom-prefixable API keys for your applications using the Web Crypto API.

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Generated API Key

Secure API Key Generator Online

Building a public API and need to issue access tokens to your developers? Our free online API Key Generator instantly creates highly secure, cryptographically random bearer tokens and client secrets. Unlike standard random strings, these keys have enough entropy to prevent brute-force attacks against your authentication endpoints.

Customizable Prefixes: Modern APIs (like Stripe or GitHub) prefix their keys (e.g., sk_live_...). Our tool natively supports appending custom prefixes to help your security systems easily identify secret types in logs and codebases.

Core Features

  • Prefix SupportEasily prepend identifiers like pk_test_ or ghp_ to your keys. This makes secret scanning via regular expressions significantly easier.
  • Cryptographic EntropyUses your device's native Cryptographically Secure Pseudorandom Number Generator (CSPRNG) to guarantee that every generated key is mathematically unpredictable.
  • Customizable Lengths & CharactersNeed a 32-character key? A 64-character token? Need to exclude ambiguous characters like '1', 'I', '0', or 'O'? Fully customize the output to match your database schema constraints.

Example: API Key Structures

Standard Bearer Token
aB9x... (64 chars)
Ideal for generic OAuth2 bearer tokens and high-security internal service-to-service communication.
Prefixed Secret Key
sk_live_51OQaX...
Highly recommended. The prefix helps developers know what environment the key belongs to instantly.

Related Tools

AES Key GeneratorGenerate symmetric keys for database or file encryption.RSA/EC Key GeneratorGenerate asymmetric public/private key pairs.UUID GeneratorGenerate standard version 4 UUIDs for public IDs.Password GeneratorGenerate strong, random passwords with special characters.

Categories

CryptographySecurity

Frequently Asked Questions

Why should I use prefixes on my API keys?
Prefixes (like pk_test_) are a best practice adopted by major API providers like Stripe and GitHub. They allow developers to easily distinguish between production and test keys, and they make it incredibly easy for Secret Scanning tools (like GitHub Advanced Security) to find leaked credentials via regular expressions before hackers do.
How are these keys generated securely?
We use the Web Crypto API (crypto.getRandomValues()) to pull high-quality entropy directly from your operating system. This ensures the random bytes generated are mathematically unpredictable and safe against brute-force guessing attacks.