How Can I Create a Professional-Looking PDF from User Inputs?

You can use a variety of PDF libraries depending on your tech stack. For instance, Typst combined with WASM can work well in JavaScript, or you could wrap a LaTeX binary within an RPC framework. Just be cautious with security, as malicious users might find ways to inject harmful code through your API.

A simple solution is to use a headless browser for generating the PDF. This way, you can utilize regular CSS styling just like you do for your website. It makes the whole process much easier.

Consider creating a page styled with CSS specifically for print media queries. Users can print it directly. You could also construct the page and use a library to generate the PDF from it. Tools like Playwright can visit and render your page to produce a PDF on demand.

I'd recommend working with a professional designer to create a PDF template. With a basic understanding of PDF formatting, you can fill in the necessary information without making the layout look unappealing. Avoid complicating your PDF's design, and explore ways to save your original design so that it's easy to work with later.