ランダムパスワード生成

各パスワードはWeb Crypto APIで真の暗号論的乱数——近道なし。

100%安全 無料・無制限 登録不要 ブラウザ上で動作

📋 When to Use Truly Random Passwords

Use cryptographically random passwords when you need maximum unpredictability. Unlike human-chosen passwords which follow subconscious patterns, crypto-random passwords have zero patterns. Essential for: password manager master passwords, encryption keys, API tokens, and any account where a breach would be catastrophic. Uses crypto.getRandomValues() — the same RNG your browser uses for TLS encryption.

📊 Technical Breakdown — random

  • Entropy: crypto.getRandomValues() API
  • Crack time: Zero predictability
  • Security level: Cryptographic
  • Best for: All accounts. Maximum security.

All calculations assume random with mixed character types. Actual security depends on specific character selection.