JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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 you are using the "Image" field, you can easily change its layout and its dimension by the available options found at the top menu. Noticed that there are the "Height" and the "Width" options where you can change the values from there.
If you need more information on this, please let us know the image and the form you are working on. We'll wait for your response.