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.
While you can Generate Excel Report from the users' submission - http://www.jotform.com/help/101-Generate-Excel-Report - doing it the other way around is not possible as we do not have a feature to have the form autopopulate from an excel page
But if it is a simple copy-pasting of information, not exactly autofill, then yes, users can do that.
Let us know if you need further assistance. Thanks!