免费工具
Password Generator
Generate cryptographically random passwords with entropy scoring. Choose length, character types, and quantity — up to 50 at once.
Password Generator
16 characters
4128
Very Strong103 bits of entropy
Entropy and password strength
Entropy (measured in bits) quantifies how unpredictable a password is. Higher entropy = harder to crack. A 16-character password with uppercase, lowercase, digits, and symbols has ~100 bits of entropy — considered Very Strong.
Cryptographic randomness
This tool uses window.crypto.getRandomValues — a cryptographically secure random number generator built into all modern browsers. It is suitable for generating real passwords.
How to use
- Set the desired length (4–128 characters).
- Toggle character types: uppercase, lowercase, numbers, symbols.
- Set how many passwords to generate (1–50).
- Click Generate and copy your password.
Passwords are generated in your browser using the Web Crypto API — nothing is sent to any server.
常见问题
- How random are the generated passwords?
- They use the browser's cryptographically secure random number generator (crypto.getRandomValues), making them suitable for real use.
- What password length should I use?
- At least 16 characters for most accounts. Use 32+ for high-security contexts like encryption keys.