Password Generator – Create Strong, Secure Passwords Instantly
Our free password generator creates strong, random passwords tailored to your exact security requirements. Simply choose your desired length, character types, and quantity, and get cryptographically random passwords in an instant. Using a unique, complex password for every account is one of the most important steps you can take to protect your online security.
Longer passwords are significantly more secure. We recommend at least 16 characters.
Adds uppercase letters to increase complexity.
Adds lowercase letters to the character pool.
Adds digits to increase password entropy.
Adds special characters for maximum security.
Removes characters that can be easily confused when reading a password.
Generate multiple passwords at once to have options to choose from.
Your results will appear here
How to Use This Calculator
1. Use the slider to select your desired password length — we recommend at least 16 characters for strong security. 2. Check or uncheck the character type options: uppercase letters, lowercase letters, numbers, and symbols. Include as many types as possible for maximum strength. 3. Optionally enable 'Exclude Ambiguous Characters' to avoid characters like O, 0, l, and 1 that can be easily confused. 4. Select how many passwords you want to generate from the dropdown — useful if you want several options to choose from. 5. Click Generate and your password(s) will appear instantly along with a strength rating and entropy score. 6. Copy your chosen password and store it securely in a reputable password manager.
How Password Security Works
Password security is measured primarily by two factors: length and complexity. A longer password with a wider variety of character types is exponentially harder for attackers to crack using brute-force or dictionary attacks.
What Is Password Entropy?
Entropy measures the unpredictability of a password, expressed in bits. It is calculated using the formula:
Entropy = L × log₂(N)
- L = Password length (number of characters)
- N = Size of the character pool (total number of possible characters)
The higher the entropy, the more guesses an attacker would need on average to crack your password. A password with 80+ bits of entropy is considered very strong against modern attacks.
Character Pool Sizes
- Lowercase only (a–z): 26 characters
- Lowercase + Uppercase: 52 characters
- + Numbers: 62 characters
- + Symbols: ~88–94 characters
Password Strength Ratings
- Very Weak: Under 28 bits — easily cracked in seconds
- Weak: 28–35 bits — crackable in minutes to hours
- Fair: 36–59 bits — may resist casual attackers
- Strong: 60–79 bits — resistant to most attacks
- Very Strong: 80–99 bits — highly secure
- Extremely Strong: 100+ bits — resistant to all practical brute-force attacks
Best Practices for Password Security
- Use a unique password for every account — never reuse passwords.
- Store passwords in a trusted password manager such as Bitwarden, 1Password, or KeePass.
- Enable two-factor authentication (2FA) wherever possible for an extra layer of security.
- Never share passwords via email or messaging apps.
- Change passwords immediately if you suspect a breach.