Password Generator

Creating strong, unique passwords for every online account is one of the most important security practices, yet most people reuse weak passwords across services. This tool 生成s cryptographically secure random passwords tailored to your needs, ensuring each one is genuinely unpredictable and resistant to brute-force attacks.

Why password complexity matters

Password strength depends on three factors: length, character variety, and randomness. A password with only lowercase letters has roughly 26 possible characters per position, but adding uppercase letters, numbers, and symbols exponentially increases the possibilities. A 16-character password with all character types would take billions of years to crack through brute force—assuming the attacker knows nothing about the password's construction.

How this generator works

The tool uses your ブラウザ's Web Crypto API (crypto.getRandomValues) to 生成 cryptographically secure random bytes, which are then mapped to your chosen character set. All generation happens locally on your デバイス—データは送信されません to any server, and no one else sees what you 生成. You control the length from 8 to 64 characters and can include or exclude uppercase letters, lowercase letters, numbers, and special symbols based on each service's requirements.

When to use it

Run this tool whenever you 作成 a new online account, whether for email, banking, social media, or development platforms. The strength meter helps you understand whether your configuration meets best practices. For most users, a 16-character password with all character types enabled provides excellent security while remaining manageable for password managers to store and retrieve.