🔐 Password Generator
Generate strong, random passwords with customizable options for length and character sets.
How to Use This Generator
Set password length
Use the slider to choose a password length between 8 and 128 characters. Longer passwords are generally more secure.
Select character sets
Choose which character types to include: lowercase, uppercase, digits, and/or symbols. More character types increase password strength.
Generate password
Click the "Generate Password" button to create a random password using your selected options.
Copy and use
Click "Copy" to copy the password to your clipboard. Use it immediately or store it securely in a password manager.
Password Strength Formula
Entropy (bits) = Length × log₂(Character Set Size)
Password entropy measures the randomness and unpredictability of a password. Higher entropy means stronger passwords that are harder to crack.
Example
A 16-character password using lowercase, uppercase, digits, and symbols (94 possible characters) has entropy = 16 × log₂(94) ≈ 105 bits, which is considered "Strong".
Full Description
This password generator creates cryptographically secure random passwords using the Web Crypto API. Each password is generated using random values that are suitable for cryptographic purposes, ensuring true randomness rather than pseudo-randomness.
The generator allows you to customize password length and character sets. You can include lowercase letters, uppercase letters, digits, and symbols. The tool calculates password entropy to help you understand password strength, with entropy values categorized as Very Weak, Weak, Moderate, Strong, or Very Strong.
Best Practices
- Use long passwords: Aim for at least 16 characters for important accounts.
- Include multiple character types: Mix lowercase, uppercase, digits, and symbols for maximum security.
- Use unique passwords: Never reuse passwords across different accounts.
- Store securely: Use a reputable password manager to store your passwords.
- Enable 2FA: Combine strong passwords with two-factor authentication for better security.
Security Features
- ✅ Uses cryptographically secure random number generation
- ✅ Passwords are generated client-side (never sent to servers)
- ✅ No password history or storage
- ✅ Entropy calculation for strength assessment
Frequently Asked Questions
How secure are the generated passwords?
Passwords are generated using the Web Crypto API, which provides cryptographically secure random values. This ensures true randomness suitable for security applications.
What password length should I use?
For most accounts, 16-20 characters is recommended. For highly sensitive accounts, consider 24+ characters. Longer passwords generally provide better security, but balance length with usability.
Are passwords stored or transmitted?
No. All password generation happens in your browser. Passwords are never sent to any server or stored anywhere. They exist only in your browser session.
What is password entropy?
Entropy measures the randomness and unpredictability of a password in bits. Higher entropy means more possible password combinations, making brute-force attacks more difficult. Entropy = Length × log₂(Character Set Size).
Can I use these passwords for all my accounts?
While these passwords are strong, you should use a unique password for each account. Consider using a password manager to generate and store unique passwords for all your accounts.
What if a website has specific password requirements?
Adjust the character sets and length to match the website's requirements. For example, if a site requires at least one symbol, make sure symbols are enabled. If it has a maximum length, adjust the slider accordingly.