Password Generator

A client-side password and passphrase generator with theme toggle, strength meter, and copy support.

Project Structure

password-generator/
├── index.html                    # App markup
├── style.css                     # Styling and themes
├── script.js                     # Generation logic and UI behavior
├── README.md                     # Project documentation
└── images/
    └── Password-generator.png    # README screenshot

Run

1. Quick start: open index.html in your browser.
2. Local server option:
   • From password-generator/, run:

     python3 -m http.server 8000

   • Open http://localhost:8000.

Requirements

• A modern web browser
• Optional: Python 3 (only needed for local server mode)

Browser Support

• Google Chrome (recent versions)
• Microsoft Edge (recent versions)
• Mozilla Firefox (recent versions)
• Safari (recent versions)

How to Use

1. Choose a mode: Password or Passphrase.
2. Set the length (or word count for passphrases).
3. Toggle character types and optional exclude-similar.
4. Click Generate Password.
5. Click Copy Password (or press Ctrl/Cmd + C).

How It Works

• Generates passwords locally in the browser.
• Uses crypto.getRandomValues for cryptographically secure randomness.
• Ensures at least one character from each selected type when applicable.
• Estimates strength and entropy based on the generated output.
• Stores theme preference with localStorage.

Features

• Custom length (4-50) with guaranteed inclusion of selected character types
• Uppercase, lowercase, numbers, symbols toggles
• Exclude similar characters (O/0, l/1, I)
• Passphrase mode (word list, 2–10 words, separator: random, -, ., _, space)
• Strength indicator (heuristic)
• Entropy estimate (bits, based on unique characters in the generated password)
• Copy to clipboard with cooldown and toast feedback
• Light/dark theme toggle
• Keyboard shortcuts (Enter = generate, Ctrl/Cmd + C = copy)
• Cryptographically secure randomness via crypto.getRandomValues
• Remembers theme preference with localStorage
• Auto-generates a password on page load

Limitations

• Strength is an estimate and not a guarantee of real-world resistance.
• Entropy values are approximate and based on selected/generated character sets.
• Browser clipboard permissions may affect copy behavior.

Privacy

• Passwords and passphrases are generated locally in your browser.
• No backend service is required for generation.
• Theme preference is stored in localStorage.

Roadmap

• Add customizable passphrase word lists.
• Add export/import for generator presets.
• Improve strength feedback explanations.
• Add optional strict policy templates (e.g., enterprise defaults).

Notes

• Passwords are generated locally in the browser.
• If you select multiple character types, length must be at least the number of selected types.