Free Password Generator

What is a password generator?

A password generator is a free online tool that helps you create secure, random passwords of any length and character set for use in any account or system. It runs entirely in your browser — no signup, no app, and no data is ever sent to a server.

Every site wants a different password — some require a symbol, others don't allow certain characters, some max out at 16 characters, others want at least 12. This generator creates random passwords based on your exact requirements: pick the length, check the character types you need, and generate one or a whole batch. Uses the browser's crypto API, so the randomness is as good as you'll get without specialized hardware.

How it works

The generator uses the browser's Web Crypto API (window.crypto.getRandomValues) to produce truly random passwords — not the predictable pseudo-random output from Math.random(). Each character is independently selected from your chosen character set, ensuring maximum entropy and unpredictability.

When to use a password generator

Use a free password generator whenever you create a new account, update an existing password, or need a secure token. Every account should have a unique, randomly generated password — reusing passwords across sites is the leading cause of account compromise in data breaches.

Common password generator mistakes

The single biggest mistake people make with password generators is using them once and then reusing the same generated password across multiple sites. A strong password is useless if it is shared between your email and your bank. Use a password manager to store unique passwords for every site. Second, many users generate passwords that are too short — anything under 12 characters can be brute-forced in under 24 hours with modern GPU hardware, and 16 characters should be your absolute minimum for important accounts. Third, people frequently exclude certain character types because a site allows it, but each excluded type dramatically reduces the password's entropy. A 16-character password with lowercase only has 2^75 possible combinations versus 2^101 with all character types included. That difference matters against a determined attacker.

Another mistake I see regularly: relying on browser-generated passwords without backing them up in a dedicated password manager. If your browser profile gets corrupted or you switch browsers, those passwords vanish. Services like Bitwarden or 1Password sync across all your devices and browsers.

One more point: do not fall for the myth that adding a number at the end and an exclamation mark makes a weak password strong. Password crackers know about leetspeak substitutions. A truly strong password is long, fully random, and unique per site — regardless of which symbols appear in it.

How to use this calculator

1. Choose your password length — Drag the length slider to set how many characters your password should contain. 16–20 characters is recommended for most accounts.
2. Select character types — Check or uncheck uppercase letters, lowercase letters, numbers, and symbols to customize what characters appear in your password.
3. Copy your password — Click the Copy button to copy the generated password to your clipboard, then paste it into your password manager or account settings.