Password Generator

Free Secure Password Generator

Generate strong, cryptographically secure random passwords instantly. All passwords are generated entirely in your browser using the Web Crypto API — nothing is stored or sent over the internet. This is the same cryptographic randomness used by password managers like Bitwarden and 1Password.

How It Works

This tool uses crypto.getRandomValues(), a cryptographically secure random number generator (CSPRNG) built into every modern browser. Unlike Math.random(), which uses a predictable algorithm, the Web Crypto API draws entropy from your operating system's random number pool — making the generated passwords truly unpredictable and suitable for high-security applications.

What Makes a Strong Password?

Password strength is measured in bits of entropy — the higher the entropy, the harder the password is to crack. Entropy depends on two factors: the length of the password and the size of the character set used.

• 8 characters, lowercase only — ~38 bits of entropy. Crackable in minutes with modern hardware.
• 12 characters, mixed case + digits — ~71 bits. Resistant to most brute-force attacks.
• 16 characters, all character types — ~105 bits. Extremely strong for all current threats.
• 20+ characters, all types — ~131+ bits. Future-proof against quantum computing threats.

Password Strength Tips

• Length matters most — Every additional character exponentially increases the time needed to crack a password. A 20-character password is billions of times stronger than a 10-character one.
• Mix character types — Include uppercase, lowercase, digits, and symbols for maximum entropy per character.
• Never reuse passwords — Use a unique password for every account. A breach of one service shouldn't compromise all your accounts.
• Use a password manager — Tools like Bitwarden (free), 1Password, or KeePass store your passwords securely so you don't need to remember them.
• Enable two-factor authentication — Even the strongest password benefits from an additional authentication layer like TOTP or a hardware key.

Real-World Use Cases

• Account Registration — Generate a unique, strong password for each new online account.
• Database Credentials — Create secure passwords for database users, API tokens, and service accounts.
• Wi-Fi Network Keys — Generate a long, random WPA3/WPA2 key for your wireless network.
• Encryption Passphrases — Create strong passphrases for disk encryption, GPG keys, and SSH keys.
• Temporary Access Codes — Generate one-time passwords or invitation codes for team members.

Frequently Asked Questions

Is this password generator safe?

Yes. Passwords are generated locally in your browser using cryptographically secure randomness. No password ever leaves your device — we have no server-side code and cannot see or store your passwords.

How long should my password be?

At least 16 characters for important accounts like email, banking, and cloud services. 20+ characters with all character types enabled gives excellent security. For the highest security (e.g., master passwords), use 24 or more characters.

Should I include symbols in my password?

Yes, when possible. Including symbols like !@#$%^&* significantly increases entropy. However, some systems restrict allowed characters — in that case, compensate by making the password longer.

What does "exclude ambiguous characters" mean?

Ambiguous characters are visually similar: 0 (zero) and O (letter O), 1 (one) and l (lowercase L) and I (uppercase i). Excluding them makes passwords easier to read and type manually, which is useful for passwords shared verbally or on paper.

Why is my generated password shown in plain text?

The password needs to be visible so you can copy it. Since everything runs locally in your browser with no network requests, there is no risk of interception. Copy it to your password manager and close the tab.

Can someone guess a randomly generated password?

A 20-character password with all character types has over 131 bits of entropy. Even with a billion guesses per second, it would take longer than the age of the universe to brute-force. Random passwords are effectively unguessable.