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.
Thank you for contacting us.
You will be able to upload a max size of 1 GB per form, you have 10 GB of limit, and once you reach the limit you will have to delete old submissions in order to get Free space.
I would also to share you this guide : http://www.jotform.com/help/33-Changing-the-Upload-Size-Limit
There you will find how to change the upload size limit and more info about it.
Do let us know if you need more help, we will be glad to assist you.