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.

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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.

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    How does JotForm authenticate uploaded files during user-to-user transmission?

    Asked by Will Pittman  on February 20, 2015 at 10:32 AM

    Good Morning!

    From what I can tell through information JotForm has provided, when a file is uploaded via a form it may pass through a couple different servers along the way before the form owner is sent the uploaded file. My question to you is, how does JotForm verify that the file that is originally uploaded and submitted by the first user is the same exact file that is received by the form owner? Is the file hash valued at the beginning and end of the process and check if they are the same? Is simply just a "look-and-see" to compare the two files and see if they align? I hope you may be able to provide some insight on this question, thanks!

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    Answered by Carina on February 20, 2015 at 12:13 PM

    In the database the uploaded file gets associated with the form ID and Submission ID. You can see it in the file download url:


    42534339774967 - form ID

    293800461681531593 - Submission ID

    Let us know if you need further clarification.

    Thank you