Password Generator & Strength Checker

About Password Generator & Strength Checker

Create cryptographically strong random passwords with customizable length and character sets — uppercase, lowercase, numbers, and symbols — then immediately test any password's strength with feedback on length, complexity, common patterns, and estimated crack time. The generator uses your browser's Web Crypto API, which draws from a true system-level random source rather than a predictable pseudo-random function, so the passwords it produces are safe for email, banking, and password-manager vaults. Pick a length of 16 characters or more with all character types enabled for the strongest results. Nothing is generated on, sent to, or stored on a server.

How To Use

  1. To generate: set a length (16+ is a strong default) and toggle which character types to include — uppercase, lowercase, numbers, symbols.
  2. Generate a password drawn from the Web Crypto API, then copy it straight into your password manager.
  3. To check a password instead, type or paste it into the strength field and read the feedback on length, variety, and estimated crack time.

Example

Input: A request for a 20-character password with all character types for a new bank login.

Output: A value like q7$Rf2!kLm9@Wx4Zt#Pb with a strength rating and an estimated crack time of centuries — generated and scored without anything leaving your device.

Who Uses Password Generator & Strength Checker

  • Developers who need private hash, password, and encryption tools.
  • Anyone verifying files or generating secrets without uploading.
  • People who require private — files and text stay on your device and are never uploaded to a server.

Frequently Asked Questions

How long should a password be?

Aim for at least 12–16 characters. Length matters more than complexity for resisting brute-force attacks, so a 16-character password with mixed character types is a strong default for most accounts.

Is the password generator truly random?

Yes. It uses the Web Crypto API (crypto.getRandomValues), which draws from your operating system's cryptographically secure random source — not a predictable math.random function.

How is password strength calculated?

The strength checker looks at length, character variety (upper, lower, digits, symbols), predictable patterns, and common dictionary words, then estimates how long a brute-force or dictionary attack would take to guess it.

Is my password stored or sent anywhere?

No. Both generation and strength checking run entirely in your browser. Nothing you type is transmitted or stored — close the page and it is gone.

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