Event Certificate Generator Webpage

I need a single-page HTML application that lets me create and immediately download event participation certificates through the browser—no server-side component. The page must be fully responsive, built with vanilla HTML, CSS and JavaScript (you may add a lightweight JS library for the QR code)... (Budget: ₹600 - ₹1500 INR, Jobs: CSS, Event Management, Frontend Development, HTML, HTML5, JavaScript, Web Application, Web Development, WordPress)