Free Secure Password Generator
Generate strong, random passwords, passphrases & PINs with real-time security analysis. Cryptographically secure. 100% client-side.
- Crypto-Secure
- Entropy Scoring
- Crack-Time Estimator
- Batch Generation
- No Data Sent
No passwords generated yet.
How Password Strength Works
Password strength is measured in entropy — the number of bits of randomness. A password with n possible characters has log₂(nˡᵉⁿᵍᵗʰ) bits of entropy. Higher entropy means exponentially more guesses are required to crack the password by brute force.
40–50 bits
Weak. Could be cracked in hours to days on consumer hardware. Avoid for any important account.
50–65 bits
Medium. Resistant to casual attacks but vulnerable to dedicated efforts. Acceptable for low-risk accounts.
65–80 bits
Strong. Would take years to decades with current hardware. Good for most online accounts.
80+ bits
Very Strong. Effectively uncrackable. Recommended for banking, email, and admin accounts.
Security Tips
Use Unique Passwords
Never reuse passwords across accounts. A single breach can compromise everything if passwords are shared.
Enable 2FA
Two-factor authentication adds a second layer even if your password is compromised. Use an authenticator app over SMS.
Use a Password Manager
Store generated passwords in a trusted password manager. You only need to remember one master password.
Update Regularly
Change passwords for critical accounts every 6–12 months. Immediately change any password after a known breach.
Avoid Personal Info
Never include your name, birthday, pet's name, or other guessable information in passwords.
Generate Offline
This tool works entirely in your browser. No data is transmitted. You can even use it without internet after loading.
Frequently Asked Questions
A strong password has high entropy — it is long, uses uppercase, lowercase, numbers and symbols, and is randomly generated rather than based on dictionary words. Passwords with 80+ bits of entropy are considered very strong and are practically uncrackable.
Yes. This tool uses the Web Crypto API (crypto.getRandomValues) for cryptographically secure random number generation. Everything runs in your browser — passwords are never transmitted to any server. You can verify this by using the tool offline.
Truly random passwords with sufficient length are virtually impossible to guess. A 16-character password using all character types has over 100 bits of entropy, requiring longer than the age of the universe to brute-force with current technology.
For most accounts, 16 characters is recommended. For high-security applications (admin, encryption), 20–32 characters provides additional protection. The minimum secure length is 12 characters using all character types.
A passphrase is a password made of multiple random words separated by a delimiter. Passphrases are easier to remember while still providing high entropy. A 5-word passphrase provides roughly 64 bits of entropy from a standard word list.
Yes. Using the same password across accounts means a single data breach can compromise all of them. Generate a unique random password for every service and use a password manager to store them.