Free Strong Password Generator

What this password generator does

This free online password generator creates truly random passwords using crypto.getRandomValues() — the same cryptographically secure random source browsers use for HTTPS connections and WebAuthn credentials. You can choose between two modes: random-character passwords (highest strength per character, best for password managers) or memorable passphrases in the style of EFF’s Diceware wordlist (best for master passwords you must type from memory). Every configuration is exposed, from length and character classes to excluding visually similar characters. Bulk-generate up to 100 at a time. Nothing is ever logged, uploaded, or stored — open your browser’s DevTools Network tab and confirm: zero requests fire when you click Generate.

How to use the password generator

1. Choose your mode — Random password (highest security) or Passphrase (easier to remember).
2. Set length: for random passwords, slide 4–128 characters. For passphrases, pick 3–10 words. Longer is always safer.
3. Toggle character classes to match a site’s requirements: uppercase, lowercase, digits, symbols, and exclusion options.
4. Click Generate, or the 🔄 refresh icon, to get a new password.
5. Copy with 📋. Refresh the page any time to erase everything — no history is kept.
6. Bulk mode: type a number (1–100) next to Generate to create a whole list of passwords at once, useful when creating multiple accounts or seeding a database.

What makes a strong password?

Length is the single most important factor — more important than symbols, mixed case, or “complexity.” According to NIST SP 800-63B (the current US federal password guidance), a 12-character random password is stronger than an 8-character password with mandatory symbols. This is because each extra character multiplies the possible combinations by ~62 (for A-Z + a-z + 0-9), while adding a special-character requirement typically increases the pool by only a few characters.

Practical length targets for 2026:

• Personal accounts — 16 characters minimum for random, 4 words minimum for passphrases
• Financial / email / password manager master — 20+ characters or 5+ word passphrase
• Encryption keys / high-value accounts — 24+ characters or 6+ words

Random password vs passphrase — which to use?

Bit-for-bit, a random password is denser (more strength per character). But because you can make a passphrase much longer while still remembering it, a 6-word passphrase (~78 bits) beats an 8-character random password (~50 bits) in real-world usability. Use random passwords for everything stored in a password manager and passphrases for the small number of passwords you must type from memory.

Password entropy explained

Entropy measures how hard a password is to guess, expressed in bits. Each bit doubles the number of possibilities an attacker must try. Practical targets:

• Below 28 bits — crackable in seconds. Very weak.
• 28–50 bits — crackable in hours to days with modern GPUs. Weak.
• 50–75 bits — crackable in months to years. Fair.
• 75–100 bits — currently uncrackable by any single attacker. Strong.
• Above 100 bits — cryptographically secure against foreseeable attack. Very strong.

Our generator shows live entropy so you can see the impact of every setting change. Turning off symbols on a 12-character password might drop entropy from 78 to 68 bits — still safe. Reducing length from 16 to 8 characters drops it much more.

Security features of this generator

• Cryptographically secure randomness — crypto.getRandomValues(), the same source browsers use for HTTPS and WebAuthn per MDN. Never Math.random(), which is predictable and unsuitable for passwords.
• Modulo bias mitigation — we use Uint32Array and modulo the character pool size, keeping bias mathematically negligible for realistic pool sizes.
• Zero network activity — disconnect from WiFi and this still works. Verify in DevTools Network tab.
• No history stored — passwords exist only in your browser’s memory. Refresh the page and they’re gone.
• Live entropy meter — see the exact bits of entropy for each generated password.
• Cryptographically secure everywhere — Chrome, Firefox, Safari, Edge on desktop, iOS, and Android all implement Web Crypto identically.

Password generator comparison

Pro tips for password security

• Use a password manager. Never memorize more than a handful of passwords. Bitwarden (free) and 1Password (paid) are the two most-recommended options in 2026.
• Enable two-factor authentication on every important account. A strong password + 2FA is far safer than a stronger password alone. Prefer TOTP apps or hardware keys over SMS.
• Never reuse passwords across sites. When one site is breached, attackers try your password on every other site. Password managers make reuse unnecessary.
• Turn off “exclude symbols” only if a site refuses them. Some banking sites and legacy systems reject certain characters. Diagnose by trying to save, then retry without those characters.
• Turn on “exclude similar characters” if you’ll ever need to read a password aloud or write it down — l/I/1 and 0/O are indistinguishable in many fonts.
• For master passwords, use a 6+ word passphrase. Length beats complexity for memorability. Type it a few times to lock it into muscle memory.