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.
The default file extensions types that are supplied and accepted are:
pdf, doc, docx, xls, xlsx, csv, txt, rtf, html, zip, mp3, wma, mpg, flv, avi, jpg, jpeg, png, gif
You can allow all files by adding an asterisk "*" in Extension box inside of Form Builder.
More about File Types/Extensions you can find inside of this guide:
Default size of upload field is 1MB. Maximum upload size is 1GB. However please note that free account have only 100 MB of upload storage space.
This guide can help you to create upload forms:
Hope this will help. Let us know if you need further assistance.