Tools/Password Generator

Free Secure Password & Passphrase Generator

Generate strong random passwords and Diceware-style passphrases locally in your browser. Uses the standard Web Crypto API, includes entropy feedback, and sends nothing to a server.

Made by Mr Binary Sniper

Password Settings

20
1
11005001000

Entropy & Security Metrics

Calculated Entropy:0 bits
Strength:Extremely Weak
Est. Crack TimeInstantly

Generated Results

Generating...

Why is Password Entropy Important?

Entropy is a mathematical measure of the unpredictability or randomness of a password. In cybersecurity, it is measured in **bits**. The higher the entropy value, the harder a password is to brute-force or guess.

< 50 Bits: Weak

Guessed within seconds by basic cracking engines. Avoid for any real account.

50 - 70 Bits: Moderate

Suitable for low-risk online accounts, but vulnerable to customized GPU dictionary attacks.

71 - 90 Bits: Strong

Highly secure. It would take modern computing clusters millions of years to decipher.

> 90 Bits: Extremely Strong

Perfect cryptographic grade security. Exceeds standard defense system requirements.

Passwords vs. Passphrases: Which Should You Choose?

Option A: Cryptographic Password

Made of dense, completely random character sets containing numbers, capital letters, and symbols (e.g. 9k$fL@7#pP!qW).

  • Best for machines, API keys, WiFi settings, and systems that restrict character types.
  • Nearly impossible to remember; requires a password manager.

Option B: Multi-word Passphrase

Uses a sequence of random dictionary words (e.g. apple-bee-milk-gray). This uses the **Diceware** method.

  • Best for main login keys, laptop passcodes, and master passwords.
  • Highly secure due to length, yet easy for humans to type and recall.

Frequently Asked Questions

Are my generated passwords sent to a server?

No. Passwords and passphrases are generated locally in your browser with client-side JavaScript. Generated values are not uploaded, logged, or sent to a server.

How does the Web Crypto API make passwords secure?

Standard JavaScript Math.random() is not suitable for passwords because its output can be predictable. This tool uses window.crypto.getRandomValues(), a cryptographically secure browser API designed for stronger random values.