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🌐 QR Code Generator Web App

A simple, elegant QR Code Generator web application built with Flask, Python, and Bootstrap, featuring a responsive UI and an option to download the generated QR codes. The app is fully deployable with Gunicorn for production environments.

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🧩 Features

• Generate QR codes for any URL.
• Inline display of the QR code.
• Download QR code as a PNG image.
• Responsive design with Bootstrap 5.
• Session-based storage of the last generated QR code for download.
• Developer credit displayed on the page.

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⚙️ Technologies Used

Technology	Purpose
Python	Backend programming language
Flask	Web framework
qrcode[pil]	QR code generation
Bootstrap 5	Frontend styling & responsive design
Gunicorn	WSGI server for production deployment
HTML/CSS	Frontend markup and styling

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💡 Why render_template_string is used

In Flask, there are two main ways to render HTML:

1. render_template – renders HTML files stored in the templates/ directory.
2. render_template_string – renders HTML directly from a Python string.

In this project, we use:

render_template_string(HTML_PAGE, qr_code=qr_code)

Reasons:

• Allows embedding the full HTML directly inside app.py for a self-contained application.
• Facilitates passing Python variables (qr_code) to the HTML dynamically.
• Quick prototyping without creating separate template files.
• Keeps small projects simple and portable.

Note: For larger projects, using render_template with external HTML files is recommended for better maintainability.

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📦 Installation

1. Clone the repository

git clone https://github.com/saichaitanya-c/Qr-code-generator.git
cd Qr-code-generator

2. Install dependencies

pip install -r requirements.txt

3. Run the app locally

python app.py

4. Open in browser

http://127.0.0.1:5000/

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🖥 Usage

1. Enter the URL or text in the input box.
2. Click Generate to create the QR code.
3. View your QR code displayed on the page.
4. Click ⬇ Download QR Code to save it as a PNG.

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📁 Project Structure

FlaskQRCodeGenerator/
├── app.py                 # Main Flask application
├── requirements.txt       # Python dependencies
├── Procfile               # For Gunicorn deployment
└── README.md              # Project documentation

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🏗 Deployment

This app can be deployed to any WSGI-compatible server. For example, using Heroku:

• Procfile specifies how to run the app:

web: gunicorn app:app

• Gunicorn serves the Flask app in production.

Steps:

git add .
git commit -m "Deploy QR Code Generator"
git push heroku main

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🔑 Notes

• The QR code download works by storing the last generated URL in a Flask session.
• render_template_string is used to embed the HTML directly for simplicity.
• For production, you may separate HTML into templates for cleaner code.

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Sai Chaitanya

🌐 LinkedIn: https://www.linkedin.com/in/sai-chaitanya-kancharana/

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📜 License

MIT License – free to use, modify, and share.