Generate Strong Passwords Without Installing Anything
Generate strong random passwords in your browser using cryptographically secure randomness. Custom length, character sets, and entropy calculation.
The problem
Weak passwords are still the most common way accounts get compromised. People reuse passwords, pick short ones, or fall back on predictable patterns. Password managers help, but sometimes you just need a strong password right now — for a new service, a test account, a Wi-Fi network, or a config file. You shouldn't need to install software or trust a server with your credentials to get one.
How it works
- Set your requirements — choose the length and which character types to include (uppercase, lowercase, numbers, symbols).
- Generate — a new password appears instantly, built from cryptographically secure random values.
- Check the strength — the entropy meter shows how many bits of randomness your password has, so you know exactly how strong it is.
- Copy — one click puts it in your clipboard.
Passwords are generated using the browser's crypto.getRandomValues() API — a cryptographically secure pseudo-random number generator (CSPRNG). This is the same source of randomness used by TLS, SSH key generation, and other security-critical applications. Your password is never sent to a server. It exists only in your browser tab.
When to use this tool
Setting up a new account and your password manager isn't handy. Generating credentials for a staging environment. Creating a shared Wi-Fi password. Filling in a test fixture that needs a realistic password. Any time you need a strong, random string without installing anything or trusting a third party.
Why I built it
I kept using openssl rand -base64 24 in the terminal, but that only gives you alphanumeric output and you have to remember the right flags. A browser tool that lets me dial in the exact character set and length, shows me the entropy, and copies to clipboard is just faster.
Tips and reference
Entropy measures password strength in bits. Each bit doubles the number of possible passwords an attacker must try. A 12-character password using uppercase, lowercase, numbers, and symbols has roughly 79 bits of entropy — enough to resist brute force for the foreseeable future. For high-security use, aim for 90+ bits. Longer passwords with more character types always win.
Built with vanilla HTML/JS. No frameworks, no backend, loads instantly.