Strong Password Generator — free, private, in your browser
Create strong, truly random passwords — instantly and entirely in your browser.
This tool runs entirely in your browser. Your files are never uploaded — they stay on your device.
A strong password is the simplest way to protect your accounts, but weak or reused passwords are still the most common reason people get hacked. This tool builds genuinely random passwords using your browser’s cryptographic random generator (the Web Crypto API), so the results are unpredictable — not based on a date, word or pattern.
Everything happens on your device. The password you generate is never sent anywhere, logged or stored, so you can create credentials for sensitive accounts with confidence. Pick the length and the mix of character types, then copy your new password with a single click.
How it works
When you open this page the generator runs as plain JavaScript inside your browser tab. There is no "generate" request to a backend: every password is built locally on your own device, so nothing you create ever travels over the network, lands in a server log, or gets stored. Closing the tab is enough to make it disappear.
Randomness is the part that actually matters, and this tool does not use Math.random, which is fast but predictable and unsafe for secrets. Instead it calls crypto.getRandomValues from the Web Crypto API, the cryptographically secure generator your browser already relies on for things like TLS. To pick each character it maps those random bytes onto your chosen character set using rejection sampling, discarding values that would skew the distribution. The result is that every allowed character is equally likely, so an attacker gains no edge from guessing common patterns.
When to use it
Reach for the generator any time an account deserves its own unique password rather than a reused one. The classic case is signing up for a new service: generate a long random string, paste it into the signup form, and immediately save it in your password manager so you never have to type it again. The same applies when you rotate a password after a breach notification, or when you want to upgrade an old account that still uses something memorable and weak.
It is also handy beyond logins. The random output works well as a Wi-Fi passphrase, a database or API seed value you set once and store, an encryption passphrase, or a one-off shared secret. Because generation is local and private, you can use it for your most sensitive credentials without worrying that the value was seen by anyone but you.
Tips
Favor length over complexity. Adding characters increases the number of possible combinations far faster than sprinkling in symbols, so a longer all-letter password usually beats a short one full of punctuation. Sixteen characters is a sensible floor for important accounts, and going longer costs you nothing when a manager remembers it for you.
Keep symbols enabled unless a site rejects them, and if it does, just increase the length to compensate. Never reuse a generated password across sites, since one leak should never unlock another account. Finally, do not try to memorize these strings or store them in a plain note or spreadsheet; let a dedicated password manager hold them, and protect that manager with one strong master password plus two-factor authentication.
How to use Password Generator
- Choose a password length with the slider (longer is stronger).
- Turn the character types you want on or off — uppercase, lowercase, digits and symbols.
- Read the generated password and check the strength indicator.
- Click the copy button to copy it to your clipboard, or regenerate for a new one.
Frequently asked questions
Is the generated password sent to a server?
No. The password is created entirely in your browser and is never uploaded, logged or stored. When you close the tab it is gone, which makes this safe for your most important accounts.
How random are the passwords?
Each character is chosen using crypto.getRandomValues from the Web Crypto API — the same cryptographically secure source browsers use for security features. Rejection sampling is used so every character is equally likely, with no statistical bias.
What makes a password strong?
Length matters most. A longer password with a mix of uppercase, lowercase, numbers and symbols is dramatically harder to guess. Aim for at least 16 characters, and use a unique password for every account.
Should I use this with a password manager?
Yes. Generate a long, random password here and save it in a password manager so you don’t have to remember it. That way you can use a different strong password for every site.