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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    PDF Upload not working on Image Preview Upload widget

    Asked by leottallc on December 06, 2015 at 02:32 PM

    We have included your pdf upload tool on our Jotform course registration forms.  No matter what type of PDF we attempt to attach (or jpg file) we receive an "invalid file format" error.  No matter what we try, we can't upload a file.


    Thank you,


    Jack Hall

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    JotForm Support

    Answered by jonathan on December 06, 2015 at 05:26 PM

    I think there is a misunderstanding on the use of the Image Upload Preview widget.

    It only allows image type of file. This was the reason it doesn't work when you use PDF file since its a document type of file.


    I test using an  image file type on your jotform http://www.jotformpro.com/form/33107509003947 and it work just fine.


    For uploading PDF files, you may want to use the regular Upload field instead.

    Hope this help. Let us know if you need further assistance.