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.
Are you referring to the image file that can be uploaded in the "File Upload" tool?
You can actually limit of what type of file can be uploaded in your form. Click the File upload field and then click the "Extensions" option in the top toolbar. You'll see a box here where you can put the allowed file extensions in your form. If you're planning to receive any image file, then you can put all of them.
Let us know if this is not what you're referring to so that we can further assist you. However, please provide more details about the issue so we can help you properly. Thank you.