Zellio.io

Password Generator

Create strong, random passwords with a live strength meter.

Processed locally — nothing is uploaded

About Password Generator

Length and character sets are adjustable, and values are drawn from your browser's cryptographic random source rather than a predictable one. The meter updates as you change settings, which makes it obvious that length moves the needle far more than punctuation does.

Create strong, random passwords with adjustable length and character sets — uppercase, lowercase, numbers and symbols — and watch a live strength meter rate each result. Long, mixed passwords are dramatically harder to brute-force than short or reused ones.

Generate a unique password per account and keep them in a password manager — reuse is what turns one site's breach into every account you own. Length beats complexity: a long passphrase outlasts a short string of symbols by orders of magnitude.

Learn how this works

Generating What You Need: QR Codes, Passwords, IDs & FilesA practical guide to generating QR codes, strong passwords, UUIDs, barcodes and PDFs — all free and fully in your browser.8 min read

Frequently asked questions

Are generated passwords sent anywhere?

Never. Passwords are generated locally on your device using a cryptographically secure random source and are never transmitted to servers, stored in databases, or logged by any service. This means your generated passwords remain completely private and cannot be intercepted or recovered by third parties. Copy each password directly to your password manager and delete it from the page, ensuring your strongest secrets stay under your control.

What makes a password strong?

Length first, then variety. A long passphrase or a 16+ character mix of letters, numbers and symbols resists brute-force far better than a short complex one. A 16-character password is exponentially harder to crack than an 8-character one, even if the longer password uses fewer character types. The generator shows an entropy percentage that reflects both length and character variety, with higher entropy indicating stronger resistance to guessing attacks. Aim for at least 90% entropy and always store your generated passwords in a password manager rather than reusing them across accounts.

Should I reuse a generated password?

No — generate a unique password for every online account you maintain, then store each one securely in a reputable password manager like Bitwarden, 1Password, or your browser's built-in manager. If one website suffers a breach, your leaked password compromises only that single account, not all your other accounts. This defense-in-depth approach, combined with two-factor authentication where available, dramatically reduces your exposure to credential-stuffing attacks.

Pro Tips

  • →Customize character sets (uppercase, lowercase, numbers, symbols) and length (8-128) to match specific password policy requirements.
  • →Generate multiple passwords at once and save the strongest option to a password manager with one click.
  • →Enable passphrase mode to create memorable passwords combining real words for accounts you'll type frequently.
  • →Check entropy percentage to verify password strength and regenerate until meeting security thresholds above 90%.

Common Use Cases

  • •IT administrators bulk-generating initial passwords for new employee accounts before deploying to Active Directory.
  • •Developers creating secure API keys and tokens for third-party integrations and database connections.
  • •E-commerce platforms auto-generating temporary checkout passwords for guest account creation.
  • •Security teams running penetration tests and generating test credentials for staging environment access.

How It Compares

Unlike standalone tools like LastPass generator or 1Password, our generator runs entirely client-side with no account required, offering faster password creation than browser extensions while providing more customization options than random.org's simplistic approach.

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