app.py

from flask import Flask, request, redirect, url_for, send_file, render_template
from werkzeug.utils import secure_filename
from PIL import Image
import os

app = Flask(__name__)
app.config['UPLOAD_FOLDER'] = 'uploads'
app.config['ALLOWED_EXTENSIONS'] = {'webp'}

def allowed_file(filename):
    return '.' in filename and filename.rsplit('.', 1)[1].lower() in app.config['ALLOWED_EXTENSIONS']

@app.route('/')
def upload_form():
    return render_template('upload.html')

@app.route('/upload', methods=['POST'])
def upload_file():
    if 'file' not in request.files:
        return redirect(request.url)
    file = request.files['file']
    if file.filename == '':
        return redirect(request.url)
    if file and allowed_file(file.filename):
        filename = secure_filename(file.filename)
        filepath = os.path.join(app.config['UPLOAD_FOLDER'], filename)
        file.save(filepath)
        png_filepath = convert_webp_to_png(filepath)
        return send_file(png_filepath, as_attachment=True)
    return redirect(request.url)

def convert_webp_to_png(filepath):
    png_filepath = filepath.rsplit('.', 1)[0] + '.png'
    with Image.open(filepath) as img:
        img.save(png_filepath, 'PNG')
    return png_filepath

if __name__ == '__main__':
    os.makedirs(app.config['UPLOAD_FOLDER'], exist_ok=True)
    app.run(debug=True)