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Password Generator
Generate secure random passwords and passphrases. All generation happens locally in your browser - no data is sent to any server.
Password Security Guide
Length vs Complexity
A longer password with simple characters is often more secure than a short complex one. Each additional character exponentially increases the number of possible combinations.
PasswordCrack Time*
Ab1! (4 chars)InstantPassword1 (9 chars)Minutescorrecthorse (12 chars)DaysKj8#mP2$xL9@ (12 chars)Centuriescorrect-horse-battery (21 chars)Millennia+*Estimated at 10 billion attempts/second
Best Practices
- Use unique passwords - Never reuse passwords across different accounts
- Use a password manager - Tools like Bitwarden, 1Password, or KeePass securely store all your passwords
- Enable 2FA - Two-factor authentication adds an extra layer of security
- Avoid personal info - Don't use birthdays, names, or common words
- Consider passphrases - Easier to remember, equally secure
Understanding Entropy
Entropy measures password randomness in bits. Higher entropy = more secure.
- < 28 bits: Very weak - cracked instantly
- 28-35 bits: Weak - cracked in minutes
- 36-59 bits: Reasonable - cracked in days/months
- 60-127 bits: Strong - cracked in years/centuries
- 128+ bits: Very strong - practically uncrackable
Formula: Entropy = Length × log₂(Charset Size)
Common Mistakes
- ✗Using
password123orqwerty - ✗Substituting letters with numbers (
p@ssw0rd) - ✗Adding numbers at the end (
mypassword1) - ✗Using the same password everywhere
- ✗Sharing passwords via email or chat
Security Note: This tool generates passwords entirely in your browser using the cryptographically secure
crypto.getRandomValues() API. No passwords are ever sent to any server.