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.
If at the time of creating the Thank you page, you choose the Custom URL, you should have inserted your image in the target page previously. Custom URL is a page you create in the way you prefer to show as Thank You page. And you will use the link of that page to redirect to it at the time the user submit your form.
But if you choose the Thank You Message option, you have the choice to edit the message the way you prefer and you can also add and image to the message. To add an image to the message please follow the next steps:
1. After choosing the Thank You message option Click on Image icon.
2. Enter the Image URL and finally click on Insert.
Here is a demo form I made with image on Thank You page.
Hope this will help. Let us know if you need further assistance.