Password Generator
Generate secure random passwords with custom length and character sets
Interactive tool
What is a Password Generator?
A password generator is a tool that creates strong, random passwords using cryptographic algorithms. It combines letters, numbers, and symbols to generate secure passwords that are difficult to crack. Our generator uses the native crypto.getRandomValues API for cryptographically secure random number generation, ensuring maximum security for your passwords.
How to Use This Password Generator
- 1Set the desired password length using the slider (4 to 128 characters)
- 2Select which character types to include: uppercase, lowercase, numbers, symbols
- 3Optionally enable filters to exclude similar or ambiguous characters
- 4Click "Generate Password" to create a secure random password
- 5Copy the password or generate multiple passwords as needed
Key features
Cryptographically Secure
Uses native crypto.getRandomValues for true randomness
Custom Length
Generate passwords from 4 to 128 characters long
Character Set Options
Choose uppercase, lowercase, numbers, and symbols
Strength Meter
Real time password strength analysis with entropy calculation
Exclude Similar Characters
Avoid confusion with characters like i, l, 1, O, 0
Batch Generation
Generate multiple passwords at once for different accounts
100% Private
All generation happens locally, passwords never leave your device
Free Forever
No registration, no limits, completely free
Why Use a Password Generator?
Human created passwords are predictable and weak. Most people reuse passwords or create variations that attackers can easily guess. A secure password generator creates truly random passwords with high entropy, making them virtually impossible to crack through brute force or dictionary attacks. Using unique, strong passwords for each account is the most effective way to protect your online security.
Common use cases
- Create secure passwords for new online accounts
- Replace weak or compromised passwords
- Generate unique passwords for each service
- Create strong passwords for password managers
- Generate API keys and authentication tokens
- Create secure admin passwords for systems
Password Strength Explained
- Very Weak: Less than 28 bits of entropy, easily crackable in seconds
- Weak: 28 to 36 bits, can be cracked in minutes to hours
- Fair: 36 to 60 bits, may take days to crack with consumer hardware
- Strong: 60 to 128 bits, takes years to crack even with powerful systems
- Very Strong: 128+ bits, effectively uncrackable with current technology
What is Password Entropy?
Entropy measures password randomness and unpredictability. Higher entropy means more possible combinations, making passwords harder to crack. Entropy is calculated based on character set size and password length. A 12 character password with uppercase, lowercase, numbers, and symbols has 78 bits of entropy, requiring trillions of guesses to crack.
Tips & best practices
Use at least 12 characters
Longer passwords are exponentially more secure. Aim for 12 or more characters for critical accounts.
Include all character types
Use uppercase, lowercase, numbers, and symbols to maximize entropy and password strength.
Never reuse passwords
Each account should have a unique password. If one is compromised, others remain safe.
Use a password manager
Store generated passwords securely in a password manager instead of writing them down.
Exclude similar characters for manual entry
If you need to type the password, exclude similar characters like i, l, 1, O, 0 to avoid confusion.
Privacy & security
This password generator runs entirely in your web browser using the native crypto.getRandomValues API. No passwords are ever sent to any server, stored in any database, or transmitted anywhere. All password generation happens locally on your device. It is 100% private and secure. We recommend copying generated passwords directly to a password manager.
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Frequently Asked Questions
How secure are the generated passwords?
The passwords are cryptographically secure, generated using the native crypto.getRandomValues API which provides high quality random numbers suitable for security purposes. The randomness is provided by the operating system entropy pool, making passwords virtually impossible to predict or crack through brute force.
What makes a password strong?
A strong password has high entropy, meaning many possible combinations. This is achieved through length (12+ characters), character diversity (uppercase, lowercase, numbers, symbols), and true randomness. Our generator creates passwords with entropy ratings, where 60+ bits is considered strong and 128+ bits is effectively uncrackable.
Should I exclude similar characters?
Enable this option if you need to manually type the password, as characters like i, l, 1, O, and 0 can be easily confused. However, if you use a password manager, keep all characters enabled for maximum security and entropy.
How long should my password be?
For most accounts, use at least 12 characters. Critical accounts like email, banking, and password managers should use 16+ characters. Longer passwords are exponentially more secure. Every additional character dramatically increases the time needed to crack the password.
Are my generated passwords stored anywhere?
No. All password generation happens entirely in your web browser using client side JavaScript. No passwords are ever sent to any server, stored in any database, or logged anywhere. Your passwords are completely private and exist only on your device.
Can I use these passwords for important accounts?
Yes. These passwords are suitable for any account including banking, email, and enterprise systems. We recommend storing them in a reputable password manager like 1Password, Bitwarden, or LastPass rather than writing them down.