What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
May we know what conversion codes you are referring to? We do have Google Analytics widget that you can add to your form. Here's how you can add a widget: https://www.jotform.com/help/252-How-to-Add-a-Widget-to-your-Form
Note that if you are incorporating a script code, then it is not possible to incorporate it directly in the form builder. You can, however, do that by simply downloading the form's full source code, here's how you can download that code: https://www.jotform.com/help/104-How-to-get-the-Full-Source-Code-of-your-Form. After downloading, you can add your own custom scripts or code, but you'll need to embed it on a web page.
I hope that helps.