About This Tool

Generate strong, random passwords using the browser’s cryptographic random number generator (crypto.getRandomValues). Choose between character-based passwords and Diceware-style passphrases for maximum security. Rejection sampling eliminates modular bias for uniform randomness.

Features

Crypto-secure randomness — uses Web Crypto API with rejection sampling
Password & passphrase modes — character-based or word-based
Entropy estimation — bits of entropy calculated in real-time
Crack time estimate — how long to brute-force at 1 trillion guesses/sec
Exclude ambiguous characters — remove 0, O, l, 1, I to avoid confusion
Customizable — length, character sets, word separators, capitalize, add number

How to Use

Choose between Password or Passphrase mode
Adjust length and character sets (or word count/separator)
Optionally exclude ambiguous characters
Click Generate or copy directly to clipboard

Privacy

All password generation happens entirely in your browser using the Web Crypto API. No passwords are transmitted, stored, or logged. Your generated passwords never leave your device.

Linux Command Reference

You can generate passwords from the terminal using built-in Linux tools. Here are the most common methods:

Random Password (mixed charset)

tr -dc ‘A-Za-z0-9!@#$%^&*’ < /dev/urandom | head -c 20; echo

2!P1n4guiZoDakfl^$kb

Alphanumeric Only

tr -dc ‘A-Za-z0-9’ < /dev/urandom | head -c 20; echo

A0efMcTih9nrMk00jwcC

Using OpenSSL

# Base64 encoded (32 chars) openssl rand -base64 24 # Hexadecimal (32 chars) openssl rand -hex 16

1M6FfJr6NlDSLw9gv778Vij+TQ71K4Wq190c2dfbaa87d6913dceb851da074529

Batch Generation

for i in $(seq 1 5); do tr -dc 'A-Za-z0-9!@#$%^&*' < /dev/urandom | head -c 16 echo done

KOPzWKzFRxELibkqlg5ZcvgkwkjP5NRVqbKCBZjFF3KpiiQNMn4k6G9OCpJAPfwpR900Qx98a5lsM9KoN

Passphrase (Diceware-style)

# Pick 5 random words from system dictionary grep -E '^[a-z]{4,8}$' /usr/share/dict/words | shuf -n 5 | paste -sd '-'

coiling-hurdled-splodge-whatever-evoking

Using pwgen

pwgen is a dedicated password generator available in most distributions (sudo apt install pwgen). It supports pronounceable and fully random modes.

# Secure random, 20 chars pwgen -s 20 1 # With symbols pwgen -sy 20 1 # No ambiguous chars (0O l1I) pwgen -sB 20 1 # Pronounceable (easier to remember) pwgen 16 1

SHbLIPZyUV14zD8A3oy5^JVR/.gSlO7Oqx;I%lCxipWxHLHUUnfYohXxj4PVjeigiejeif4dooKa

# Batch: 5 secure passwords with symbols pwgen -sy1 16 5

8sQjvZe|wCt5x#10ZVFFnjMxP]4]oAvc[-c9c7jutE~DMC9xgVO3RMb=qbw7dKC4ym_QneYiM|jrVW

Entropy Calculation

python3 -c " import math pool = 26+26+10+8 # A-Z, a-z, 0-9, symbols length = 20 entropy = math.log2(pool) * length years = (2**entropy / 1e12) / 31557600 print(f'Pool: {pool} chars') print(f'Entropy: {entropy:.1f} bits') print(f'Crack time (1T/s): {years:.2e} years') "

Pool: 70 charsEntropy: 122.6 bitsCrack time (1T/s): 2.53e+17 years