I can generate a PDF with an image using the code below. How can I return the generated PDF from a Flask route?

from fpdf import FPDF
pdf = FPDF()
img = input('enter file name')
g = img + '.jpg'
pdf.add_page()
pdf.image(g, 50, 50)
pdf.output(img + '.pdf', 'F')

Use make_response to create a response with the PDF data output as a string (dest='S'). Encode the output as latin-1, otherwise Flask will encode it as UTF-8 and it may not be valid. Set the Content-Disposition and Content-Type headers to tell the browser to download/handle a PDF file. Return the constructed response.

from flask import make_response@app.route('/jpg_to_pdf/<name>')
def jpg_to_pdf(name):pdf = FPDF()pdf.add_page()pdf.image(os.path.join(app.instance_path, name + '.jpg'), 50, 50)response = make_response(pdf.output(dest='S').encode('latin-1'))response.headers.set('Content-Disposition', 'attachment', filename=name + '.pdf')response.headers.set('Content-Type', 'application/pdf')return response

This example assumes the images are in the instance folder, modify as necessary to point to where the images actually are.