Password Generator
Generate secure, cryptographically random passwords with instant strength metrics
How to Use This Password Generator
- Adjust the Password Length slider to set your desired character count (16+ characters recommended for high security).
- Toggle character types using the Uppercase, Lowercase, Numbers, and Symbols checkboxes.
- Click “Generate Password” to create a new cryptographically randomized string.
- Review the real-time Strength Meter and estimated Entropy (Bits) rating.
- Click “Copy” to instantly transfer the generated password to your clipboard.
Password Entropy Calculation
Password security is mathematically measured in bits of entropy ($E$), which quantifies how hard a password is to brute-force:
Where: L = Password Length, R = Size of Character Pool (e.g., 26 lowercase + 26 uppercase + 10 digits + 32 symbols = 94 possible characters).
Frequently Asked Questions (FAQ)
Are generated passwords saved or stored anywhere?
No. Passwords are generated entirely on your device using client-side JavaScript (`crypto.getRandomValues`). No passwords are ever transmitted to a server or saved anywhere.
What makes a password strong?
Password strength relies heavily on length and character randomness. Passwords with at least 16 characters containing mixed character sets provide exponential protection against brute-force attacks.
How many bits of entropy are considered safe?
Passwords with 60 to 79 bits of entropy offer good protection for standard accounts. Passwords exceeding 80–128+ bits of entropy are considered virtually immune to modern brute-force computing techniques.