Strong Password Generator Online
Free online strong password generator: cryptographically random passwords with adjustable length and character sets. Generated in your browser — never transmitted.
Use it in your terminal (or let an AI agent run it)
This tool also ships as a command-line version in the wasm-tools-cli
npm package — the exact same engine as this page, running locally on your machine.
npx wasm-tools-cli passwd generate --length 24About Password Generator
Password Generator is a free online data tool that runs entirely in your browser. There is nothing to install and no account to create: open the page, use the tool, and download the result. Because all processing happens locally on your device (via WebAssembly), your files and text are never uploaded to any server.
How to use Password Generator
- Paste or type your content into the input box.
- Choose the operation (and any options) and click the corresponding button.
- Copy the result or download it as a file.
Strong passwords: how random generation keeps you safe
Why password strength is about length and randomness
Attackers do not guess passwords like humans do — they try billions of candidates per second using dictionaries of leaked passwords and common patterns. What defeats them is entropy: genuine unpredictability. Every character you add multiplies the search space by the size of your alphabet.
A 12-character password using upper- and lowercase letters, digits, and symbols has about 70 bits of entropy — out of reach of online attacks and very expensive even offline. Human-invented passwords of the same length typically have far less, because we lean on words, dates, and predictable substitutions (P@ssw0rd is not random).
How this generator works
Passwords are built from your browser's cryptographically secure random source (the same one used for encryption keys), not a predictable pseudo-random generator. You choose the length and which character classes to include; every character is drawn independently and uniformly.
Generation happens in memory on the page. Nothing is sent anywhere, nothing is logged, and nothing is stored — when you navigate away, the password exists only where you copied it.
Choosing length and characters
| Use case | Recommendation |
|---|---|
| Everyday accounts | 12–14 characters, all classes |
| Email, banking, admin panels | 16+ characters, all classes |
| Sites that limit special characters | Longer length with letters + digits |
| PIN-like numeric fields | As many digits as allowed |
If a site rejects symbols, increase the length instead — length contributes more entropy than any single character class.
Passwords vs passphrases vs passkeys
- Random passwords (this tool): maximum entropy per character; need a password manager to remember.
- Passphrases (four random words): easier to type and remember; slightly less compact.
- Passkeys: the best where supported — cryptographic, phishing-resistant, nothing to memorize.
Whatever you choose: never reuse a password across sites. A breach on one site becomes a breach on all of them otherwise.
What to do with the password afterwards
Store it in a reputable password manager — that is the only place a random password should live. If you must write it down temporarily, destroy the note once it is stored. And if you suspect an old password leaked, replace it here in seconds.
Frequently asked questions
Is this password generator really free?
Yes — free, unlimited, no account. Generate as many passwords as you need.
How random are the generated passwords?
Each character is drawn independently from your browser's cryptographically secure random source — the same API used for encryption keys. They are not predictable.
Are the passwords stored or sent anywhere?
No. Generation happens in the page's memory; nothing is stored, logged, or transmitted. When you leave the page, the password exists only where you copied it.
How long should my password be?
At least 12 characters with all character classes for everyday accounts; 16+ for email, banking, and admin accounts. If a site blocks symbols, add length instead.
Should I use a password manager?
Yes — random passwords are impossible to remember by design, and a password manager is the right place to keep them. Never reuse a password across sites.
Are my files uploaded to a server?
No. All processing happens locally in your browser using WebAssembly and Web APIs. Your files never leave your computer — close the tab and nothing remains.
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