密码生成器
生成强大、安全的随机密码
使用方法
输入数值
在输入栏中填入您的数字或参数。
即时获取结果
结果在您输入时自动更新——无需按计算按钮。
复制或保存
将结果复制到剪贴板或用于您的工作流程。
为什么使用此工具
100% 免费
没有隐藏费用，没有付费等级——所有功能完全免费。
无需安装
完全在浏览器中运行。无需下载或安装任何软件。
隐私且安全
您的数据永远不会离开您的设备。不会上传至任何服务器。
支持移动设备
完全响应式设计——在手机、平板或桌面电脑上均可使用。
Generating Strong Passwords: Entropy and Best Practices
Key Takeaways
- Password strength is measured in bits of entropy — a strong password should have at least 60–80 bits of entropy.
- Randomly generated passwords with mixed character types are exponentially harder to crack than human-chosen passwords.
- Passwords are generated entirely in your browser using cryptographically secure randomness — they are never stored or transmitted.
Weak passwords remain the number one cause of account compromises. Human-chosen passwords tend to follow predictable patterns that attackers exploit with dictionary attacks and rule-based cracking. A cryptographically random password generator creates truly unpredictable passwords that resist all known attack methods, from brute force to sophisticated AI-powered cracking.
81% of data breaches involve weak or stolen passwords according to the Verizon Data Breach Report.
Breach Statistics
Key Concepts
Password Entropy
Entropy measures password randomness in bits. A password using 26 lowercase letters has log2(26) = 4.7 bits per character. Adding uppercase, digits, and symbols increases entropy to ~6.5 bits per character.
Cryptographic Randomness
This tool uses the browser's crypto.getRandomValues() API, which draws from the operating system's cryptographic random number generator — far superior to Math.random() for security.
Character Set Impact
A 12-character password using only lowercase letters (26 chars) has 56 bits of entropy. Adding uppercase, digits, and symbols (95 chars) jumps to 79 bits — making it 8 million times harder to crack.
Passphrase Alternative
Random word passphrases (like 'correct horse battery staple') offer high entropy with better memorability. Four random words from a 7,776-word list provide approximately 51 bits of entropy.
Pro Tips
Use a minimum of 16 characters for critical accounts — longer passwords exponentially increase the time needed for brute-force attacks.
Use a password manager to store generated passwords — you should never need to memorize random passwords.
Generate unique passwords for every account — password reuse means one breach compromises all your accounts.
Enable two-factor authentication (2FA) alongside strong passwords for defense in depth.
All passwords are generated entirely in your browser using the Web Crypto API's cryptographically secure random number generator. No passwords are stored, logged, or transmitted to any server.