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Cryptographic Password Generator & Entropy Calculator

Generate high-entropy random passwords using crypto.getRandomValues with character pool toggles and Shannon entropy calculations.

  • 100% free
  • Files stay on your device
  • No sign-up, no watermark
Password Length: 18 chars116.9 bits • Very Strong (Military Grade)

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What is Cryptographic Password Generator & Entropy Calculator?

Protect your digital accounts against brute-force and dictionary attacks. Generates high-entropy passwords with custom length, uppercase, lowercase, numbers, and special symbols using crypto.getRandomValues().

How to use Cryptographic Password Generator & Entropy Calculator

  1. 1

    Add your file or input

    Choose a supported file, drag it onto the upload area, or type/paste the data this tool works with.

  2. 2

    Adjust the options

    Pick the output format, quality, size or other settings the tool offers. Defaults work well for most files.

  3. 3

    Process and download

    Run the tool and save the result. Processing happens in your browser, so nothing is uploaded to a server.

Frequently asked questions

Why is crypto.getRandomValues() safer than Math.random() for passwords?

Math.random() is pseudo-random and predictable. The Web Crypto API uses cryptographically secure pseudo-random number generators (CSPRNG) seeded by physical hardware entropy from your device OS.

Are generated passwords saved or sent over the internet?

Never. Passwords are generated in your local device memory and exist only on your screen until you copy them. We have zero servers logging generated credentials.

What password length is considered unbreakable today?

A password with 16 or more mixed characters (letters, numbers, symbols) provides over 95 bits of entropy, which would take quantum supercomputers trillions of years to brute force.

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