HIFreeTools
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Free Password Generator

Generate strong, random passwords with the character types and length you choose. They’re created with cryptographically secure randomness and never leave your browser.

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Strength: Very strong
Character types

Quick answer

A strong password generator creates a random string from a chosen set of characters (lowercase, uppercase, digits, symbols). This tool uses the browser’s Web Crypto API for cryptographically secure randomness, so each password is unpredictable. A length of 16 or more with mixed character types is recommended.

Formula & method

Random values come from the browser’s Web Crypto API (crypto.getRandomValues), which is cryptographically secure — unlike ordinary Math.random. Characters are drawn uniformly from the sets you enable, using rejection sampling so no character is slightly more likely than another. Passwords are generated on your device and are never transmitted or stored.

Examples

Example 1: 16 characters, all types
Input
length 16, a–z A–Z 0–9 symbols
Result
e.g. 7t$Rq2!vKp9xWm… (unique each time)
Why
A long mixed-character password is hard to guess or brute-force.
Example 2: Digits only PIN
Input
length 6, digits only
Result
e.g. 408172
Why
Useful where only numbers are allowed, though far weaker.
Example 3: No ambiguous characters
Input
exclude look-alikes (O/0, l/1)
Result
Easier to read and type
Why
Helpful for passwords you’ll enter by hand.

When to use this tool

  • Creating a new account that deserves a strong, unique password.
  • Replacing a weak or reused password after a breach.
  • Generating an API key-style random string for personal use.

Common mistakes

  • Choosing a short password. Length matters more than complexity — aim for 16+ characters.
  • Reusing one password across sites. A unique password per account limits the damage of a breach.
  • Relying on memory instead of a password manager for long random strings.

Frequently asked questions

Are these passwords secure?

They’re generated locally with the Web Crypto API, a cryptographically secure source, and are not transmitted or stored by us. A password’s real-world security also depends on its length, where you store it, and your own device’s security — so use a long password and a reputable password manager.

Is the password stored or sent anywhere?

No. Generation happens entirely in your browser. We don’t transmit, log, or store any password you create.

How long should my password be?

For important accounts, 16 characters or more with a mix of types is a good baseline. Longer is stronger, especially when paired with a password manager.

What makes a password strong?

Unpredictability. A long random password from a large character set has high entropy, meaning there are too many possibilities to guess or brute-force.

Why not just use Math.random?

Math.random isn’t cryptographically secure and can be predictable. This tool uses crypto.getRandomValues, which is designed for security-sensitive randomness.

Can I use this password generator on my phone?

Yes. The tool runs on any browser (mobile or desktop) using the Web Crypto API. Generate, copy, and paste directly into your password manager or account form.

Sources & references

External references open in a new tab. We are independent and not affiliated with these organizations.

  • ✓ Free to use
  • ✓ No sign-up required
  • ✓ Runs entirely in your browser — nothing is uploaded.
  • ✓ Formula and method shown above
Last updated: How we calculateReport a correctionDisclaimer

Provided “as is” for general information only — results may be inaccurate, so verify before you rely on them. No warranty; use at your own risk.

Built and reviewed by HIFreeTools against the formula shown above and any authoritative references cited on this page. See our methodology and editorial standards.

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