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.
There is no specific recommendation/limit since we allow large image uploads, and also the image size may be quite different based on your goals. However, it is generally recommended to use optimized images due to performance reasons.
If you need any further assistance, please let us know. We will be happy to help.