Looking for a fast, modern, and offline-first unit converter? Meet Instant Unit Converter, a Progressive Web App (PWA) built entirely with Vanilla JavaScript (ES5)—no frameworks, no jQuery. Convert units instantly, anytime, anywhere.

✨ Features

• Wide Range of Units: Length, Mass, Volume, Temperature, Time, Speed, Area, Data Storage, Currency, and more.
• Real-Time Conversion: Results update instantly as you type.
• Offline First: Fully functional without internet thanks to a Service Worker.
• Live Currency Rates: Fetches and caches the latest exchange rates every hour.

• Modern UI/UX:

  • Sleek, responsive design
  • Light & Dark themes with gradient backgrounds
  • Searchable dropdowns for units (powered by Choices.js)
  • Smooth animations for a user-friendly interface

• Installable (PWA): Add it to your home screen for an app-like experience.

• Zero Dependencies: Pure Vanilla JavaScript, lightweight and fast.

🛠️ Tech Stack

• Frontend: HTML5, CSS3, Vanilla JavaScript (ES5)

• UI Enhancements:

  • Choices.js for searchable select boxes
  • SweetAlert2 for beautiful alerts

• PWA: Service Worker for offline caching, Web App Manifest

• Fonts: Inter – modern and readable

• API: exchangerate-api.com for live currency rates

📂 Project Structure

/unit-converter/
├── index.html
├── manifest.json
├── scripts.js
├── styles.css
├── favicon.ico
├── README.md
└── icons/

🚀 Getting Started

Since this is a PWA, opening index.html directly may not work due to Service Worker restrictions. Use a local server instead.

1. Clone the repository:

git clone https://github.com/mamedul/unit-converter.git
cd unit-converter

1. Run a local server:

• Easiest way: VS Code Live Server extension
• Or using Node.js:

npm install -g http-server
http-server

1. Open your browser at http://localhost:8080.

👨‍💻 About Me

Hi! I’m Mamedul Islam, a passionate web developer specializing in PWAs, WooCommerce, WordPress, PHP, MySQL, and modern web apps. I’ve been creating digital experiences since 2017.

📬 Connect with me:

• WhatsApp
• Fiverr
• LinkedIn
• GitHub
• X (Twitter)

I’m open to freelance projects in PWA, E-commerce, Firebase, WebSocket, PHP/MySQL, and more.

📝 License

This project is licensed under the MIT License — free to use, modify, and distribute.

If you enjoy this project, please consider giving it a ⭐ on GitHub! Your support helps keep it growing.