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 you want to change or limit the file size of the image then the answer is yes. Please check this guide on How to Change the Upload Size Limit.
You can do that by selecting the upload field then click "Properties"
After that you need to select "Max File Size" then put the appropriate value and then press the "OK" button.
But if you are pertaining on auto-resizing the image size or resolution then unfortunately the answer is no. We don't have that feature.
Hope this helps. Let us know if you have other issues.