Random Password Generator & Security Meter

How to Generate Strong, Unhackable Passwords

The Random Password Generator & Security Meter creates cryptographically random passwords, Diceware-style memorable passphrases, and numeric PIN codes. Powered by the standard Web Crypto API (window.crypto.getRandomValues), it guarantees high-entropy randomness suitable for bank accounts, email logins, password managers, and server infrastructure.

Step-by-Step Instructions:

Select Generator Mode:
- 🎲 Random Password: Cryptographic combination of letters, digits, and special characters.
- 📖 Memorable Passphrase: Easy-to-remember multi-word sequences (e.g. Galaxy-Breeze-Castle-Diamond).
- 🔢 Numeric PIN: 4 to 12-digit numeric codes for credit cards and door locks.
Customize Length & Character Sets: Adjust password length from 4 to 64 characters and toggle uppercase, lowercase, numbers, symbols, and ambiguous character exclusions (e.g. 0, O, 1, l).
Check Entropy & Crack Time: Watch real-time Shannon entropy metrics (in bits) and calculated brute-force crack time estimates.
Bulk Generation: Select 5, 10, or 20 passwords from the dropdown to generate lists for teams and batch imports.
Copy Password: Click Copy Password to copy the string to your clipboard.

Password Strength & Entropy Guide

🔐 80+ Bits of Entropy

A 16-character mixed password has ~96 bits of entropy. It would take modern supercomputers billions of years to crack via brute force.

🛡️ Cryptographically Secure Randomness

Unlike pseudo-random generators (Math.random()), the Web Crypto API sources entropy from operating system hardware noise.

🚫 No Credential Storage or Logs

All passwords are generated in-memory in your local browser window. They are never sent over the internet or logged on web servers.

📖 Diceware Memorable Passphrases

Passphrases combine 4 to 6 random English dictionary words, delivering military-grade security that humans can easily remember.

Frequently Asked Questions

How is password crack time calculated?

Crack time is calculated by determining the total mathematical permutations ($2^{\text{entropy bits}}$) divided by a high-speed offline supercomputer guessing speed (100 Billion attempts per second).

Why should I exclude ambiguous characters?

Ambiguous characters like the uppercase letter O and zero 0, or the lowercase letter l and number 1, look almost identical in standard fonts. Excluding them prevents typing errors when manually entering passwords on mobile keyboards.

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Random Password Generator & Security Meter