文字のみパスワード生成

文字のみ——大文字小文字、数字記号なし。文字制限のあるシステムに最適。

100%安全 無料・無制限 登録不要 ブラウザ上で動作

📋 When to Use Letters-Only Passwords

Only uppercase and lowercase letters — no digits or symbols. Some systems have bizarre password policies that reject numbers (yes, they exist). Also useful for generating human-readable identifiers for non-security purposes like project codes or reference numbers that should be pronounceable.

📊 Technical Breakdown — letters-only

  • Entropy: 91 bits at 16 chars
  • Crack time: ~250 billion years
  • Security level: Strong
  • Best for: Accessibility, systems blocking digits

All calculations assume letters-only with mixed character types. Actual security depends on specific character selection.