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.
You can add an upload field on your form and even customize the file types/extensions that you can accept. You can also adjust the minimum and maximum file size that the file can receive. This guide can give you more information regarding the file upload field: https://www.jotform.com/help/332-How-to-Create-Upload-Forms
If you have more questions or if there are things you need clarification, please let us know.