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.
The maximum is 1Gb but it depends on the price plan you have. For instance free plans only have 100Mb of available space.
You can see here more details on this matter.
Also the default maximum size is 1024Kb (1MB), so it is necessary to edit this limit in KB in order to accept larger files:
Let us know if we can assist you further.