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.
what are the dimensions and file types allowed for background imagesAsked by UTResearchFoundation on January 23, 2015 at 11:07 AM
JotForm Support Manager
With our Designer tool, you can use big images as a background,as big as 2,000 x 1,333 pixels
See for example this theme on our Theme Store
You can also insert images in the form and redimension them according to the width of the form itself, please find a tutorial for the Form Designer here: