Humans are remarkably bad at creating random passwords. We reuse the same password across multiple sites, lean on predictable patterns ("Password1!"), and substitute letters with obvious numbers ("p@ssw0rd"). Attackers know these habits and build cracking dictionaries around them. A proper password generator uses cryptographically secure randomness to produce passwords that are genuinely unpredictable.
According to breach analysis data, the most common passwords are still "123456", "password", and "qwerty". If you recognize any of your own passwords in a common-passwords list, a generator like this one is the fastest fix.
Password strength is measured in bits of entropy, which represents how many guesses an attacker would need to try. The formula is: entropy = log2(pool_size) x length. A larger character pool (uppercase + lowercase + numbers + symbols = 95 characters) and a longer password both increase entropy exponentially.
For context: 40 bits of entropy can be cracked in minutes. 60 bits would take years on consumer hardware. 80 bits is considered strong for most purposes. 128+ bits is effectively unbreakable with any known or foreseeable technology. A 20-character password using all character types reaches roughly 131 bits.
The strength meter on this tool calculates entropy in real time based on your selected character set and length, so you can see exactly how your choices affect security.
Use a unique password for every account. If one site gets breached (and breaches happen constantly), attackers will try that same password on every other service. This is called credential stuffing, and it works because most people reuse passwords.
Aim for 16+ characters. Length matters more than complexity. A 20-character lowercase-only password (94 bits) is actually stronger than an 8-character password with symbols (52 bits).
Use a password manager. Tools like Bitwarden, 1Password, or KeePass store your passwords in an encrypted vault. You only need to remember one master password. Generate the rest with a tool like this one.
Enable two-factor authentication (2FA) everywhere. Even the strongest password cannot protect you if the site itself is compromised. 2FA adds a second layer that survives password theft.
The "Exclude ambiguous" option removes characters like 0/O, 1/l/I that look similar in many fonts. Enable this when you need to read or type the password manually (like WiFi passwords shared on a whiteboard, or one-time setup codes). For passwords stored in a password manager, leave it off for maximum entropy.
The "Generate 10" button creates multiple passwords at once, which is useful when provisioning accounts, setting up test environments, or generating API keys for multiple services. Each password is independently random.
Need to hash a password for storage? Use the Hash Generator. Working with authentication tokens? Try the JWT Decoder. Setting up server access? The Chmod Calculator helps lock down file permissions.
This tool uses the Web Crypto API (crypto.getRandomValues()) for cryptographically secure randomness, the same source used by browsers for TLS key generation. Passwords are generated entirely in your browser. Nothing is transmitted, stored, or logged. You can verify this by opening your browser's network tab while using the tool.