JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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On JotForm, the max upload file size is 1GB per file. Below, you will find very detailed document about this subject:
While you are letting users to upload files with those sizes , please don't forget that you have a limited available space per month. If exceed that limit, you are not going to use your account until the beginning of the next month.
Also, please check the defined available space values for plans from the following URL:
If it is still blurry, please don't hesitate to contact us.