🔐 Random Password Generator
Generated entirely in your browser using cryptographically secure randomness — never sent anywhere.
Why This Is Safe to Use
This generator uses your browser's built-in cryptographically secure random number generator
(crypto.getRandomValues) — the same technology used for encryption keys — rather than a
predictable pseudo-random function. Your generated password is never transmitted anywhere; everything
happens locally on your device.
Guide: understanding your result
- Password strength comes mainly from length and true randomness. Entropy ≈ length × log2(size of the character set).
- NIST guidance favors long passwords or passphrases, checking them against breached-password lists, and not forcing periodic changes without reason.
- A unique password per site, stored in a password manager and combined with multi-factor authentication, protects you far more than complexity rules alone.
Worked example
This generator uses your browser's cryptographic random number generator (crypto.getRandomValues); passwords are created on your device and never sent to our server. A 16-character password from all 94 printable characters has about 105 bits of entropy.
Approximate entropy by length and character set
| Length | Characters used | Entropy |
|---|---|---|
| 12 characters | lowercase only | 56 bits |
| 12 characters | letters + digits | 71 bits |
| 16 characters | all printable | 105 bits |
| 20 characters | all printable | 131 bits |
Common mistakes to avoid
- Reusing one strong password on several sites.
- Making passwords "random" by hand — human patterns are easy to guess.
- Sharing passwords over email or chat.
Frequently asked questions
Is a passphrase better than a random password?
A passphrase of several random words can be both strong and memorable; length matters most. For accounts stored in a password manager, a long random password is ideal.
Official sources
Examples are calculated live from the same data the calculator uses and are for education only — they are not financial, tax or investment advice.
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