# YouTube Video Downloader Web App # This is a single-file Flask application to download YouTube videos in high quality. # Requirements: # - Install dependencies: pip install flask pytube # - Run the script: python this_file.py # - Open http://127.0.0.1:5000/ in your browser # - Enter YouTube URL and click Download from flask import Flask, request, send_file, render_template_string from pytube import YouTube import os import tempfile app = Flask(__name__) # HTML template for the single page HTML_TEMPLATE = """

YouTube Video Downloader

{% if message %}

{{ message }}

{% endif %} {% if error %}

{{ error }}

{% endif %} """ @app.route('/', methods=['GET']) def index(): return render_template_string(HTML_TEMPLATE) @app.route('/download', methods=['POST']) def download(): url = request.form.get('url') if not url: return render_template_string(HTML_TEMPLATE, error="Please enter a valid URL.") try: yt = YouTube(url) stream = yt.streams.get_highest_resolution() # Download to a temporary file with tempfile.TemporaryDirectory() as tmpdirname: filepath = stream.download(output_path=tmpdirname) filename = os.path.basename(filepath) # Send the file to the user response = send_file(filepath, as_attachment=True, download_name=filename) return response except Exception as e: return render_template_string(HTML_TEMPLATE, error=f"Error: {str(e)}") if __name__ == '__main__': app.run(debug=True)