Password Generator — Strong Random Passwords, No Server
Generate strong random passwords using your browser's cryptographically secure random number generator (crypto.getRandomValues). Set length and character types. Passwords never reach a server.
How to use this tool
- Set the desired password length.
- Toggle character types (uppercase, numbers, symbols).
- Click Generate and copy the password.
About Password Generator
The Password Generator creates strong, random passwords entirely in your browser using a cryptographically secure source of randomness. You choose a length, select which character types to include, and click Generate to get a password you can copy with one click. It is built for the everyday task of creating a unique password per account without falling back on predictable patterns or reused phrases.
Length options are 8, 12, 16, 24, and 32 characters, with 16 selected by default. Four character classes can be toggled independently: uppercase letters, lowercase letters, digits, and symbols (the symbol set is !@#$%^&*()-_=+[]{}|;:,.<>?). The selected classes are merged into a single character pool, and the password is built by drawing that many values from crypto.getRandomValues(), the browser's cryptographically secure pseudo-random number generator, the same primitive used to produce cryptographic keys. This is meaningfully stronger than Math.random(), which is not designed to be unpredictable and should never be used for secrets. If you somehow deselect every character type the pool is empty and no password is produced, so keep at least one class enabled.
Use it to create a fresh password for a new account, rotate a credential after a breach notice, or generate a passphrase-length string for a password manager to store. Because each generation is independent, every click gives you an unrelated new value.
A few honest caveats. Each character is drawn independently from the pool, so the tool does not force at least one character from every selected class; a generated password could, in principle, omit one type, though this is rare at typical lengths. The character mapping uses a modulo over the pool, which introduces only a negligible bias for these small pool sizes. The recommended practice is to generate long passwords (16 or more characters, 24 or more for high-value accounts) with symbols enabled, and store them in a password manager rather than memorizing them. Passwords are created locally and never reach a server, so the value you generate is yours alone.
Frequently Asked Questions
- Are the generated passwords cryptographically secure?
- Yes. They are produced with crypto.getRandomValues(), the browser's cryptographically secure pseudo-random number generator, which is the same source used for generating cryptographic keys. This is far more suitable for secrets than Math.random(), which is predictable and must not be used for passwords.
- How long should my password be?
- Sixteen characters or more is a good default for most accounts, which is why 16 is preselected. For high-value accounts such as email, banking, or your password manager's master password, prefer 24 or 32 characters. Longer passwords increase entropy and are dramatically harder to brute-force.
- Which character types can I include?
- Uppercase letters, lowercase letters, digits, and symbols, toggled independently. The symbol set includes a wide range of punctuation. Including symbols increases the size of the character pool and therefore the strength of the password, so enable them whenever the service allows it.
- Does it guarantee at least one of each selected character type?
- No. Each character is drawn independently from the combined pool, so a result could in theory miss one selected class, though that is uncommon at normal lengths. If a site strictly requires one of each type and you happen to get a result without one, simply generate again.
- Does the tool store or remember my passwords?
- No. Passwords are generated locally in your browser and are never sent to or saved on any server. Once you navigate away, the generated value is gone unless you copied it, so store it in a password manager.
- Why did Generate produce nothing?
- If you deselect every character type, the character pool is empty and no password can be built. Re-enable at least one of uppercase, lowercase, digits, or symbols and generate again.
- What is the best way to store the generated password?
- Use a dedicated password manager rather than trying to memorize a random string. Generate a long, unique password for each account, copy it into the manager, and let the manager fill it for you. This keeps every credential distinct and strong.
Embed this tool on your site
Free. One line of HTML — the tool runs in your visitor's browser, no data sent to anyone.
<iframe src="https://brevio.pro/embed/password-generator" width="100%" height="600" loading="lazy" style="border:1px solid #e5e5e5;border-radius:8px" title="Password Generator — brevio"></iframe> <p style="font:12px/1.4 sans-serif"><a href="https://brevio.pro/tools/password-generator">Password Generator</a> by <a href="https://brevio.pro">brevio</a></p>