Secure Token Generator

Tokens are secrets used to authenticate and authorize API requests, reset passwords, verify email addresses, and implement numerous other security 機能. A weak token is like leaving a door unlocked; a strong token is one an attacker cannot guess or brute-force. This tool 生成s cryptographically secure random tokens suitable for any security-critical use case, offering multiple output フォーマットs for different applications.

Cryptographic randomness

The difference between Math.random() and cryptographic randomness is enormous. JavaScript's Math.random() is designed for games and animations—it's predictable if you know its seed. The Web Crypto API's crypto.getRandomValues() 生成s unpredictable bytes using your operating system's secure random source. For tokens, this difference is critical: weak randomness means attackers might guess the next token, compromising your security.

フォーマット flexibility

Hex フォーマット (digits 0-9 and letters a-f) is human-readable and works in any context. Base64 is more compact, encoding more inフォーマットion in fewer characters. Base64url (Base64 without padding, with + and / replaced by - and _) is especially useful for URLs and JWT signatures, where special characters can cause encoding issues. Choose the フォーマット matching your use case.

Entropy matters

The tool lets you specify token length from 16 to 128 bytes. More bytes mean more randomness (entropy) and lower collision probability. For most 使用例, 32 bytes (256 bits) is strong enough; for critical security functions like password reset tokens, 32 bytes or more is recommended. The tool shows the entropy in bits to help you understand the security level.

Common 使用例

生成 secure tokens for API keys, password reset links, email verification tokens, CSRF protection, session tokens, or any scenario where you need random, unguessable values. Because generation happens in your ブラウザ, no token is ever transmitted or logged—perfect for creating secrets that should never leave your デバイス.