Getting corrupted PDF files on multiple uploads

  • Profile Image
    Asked on June 02, 2015 at 11:07 AM

    We are in the business of allowing our customers to upload us PDF files so that we can print them.  The biggest problem we are running into today with Jotform is that the multi file uploader will give us corrupt PDF files here are there even though the source PDF file from our customers is working perfect.  This is happening enough probably 15 to 20% of the time with just random files that we are looking at other solutions.  I want to continue with Jotform but cannot with these types of failures.  I have tried the following values:

    - set max file size

    - set "0" to allow unlimited files 

    - tested uploads and even on files that don't reach the max values I get the PDF's like they are all fine but when I open some of them they say corrupt. 


    Please advise if there is anything I can do before I have to switch to another service.  Thanks for your time!


    Don't mind the attachment.  I tried to attach one of the bad PDF's but it wouldn't let me so then I tried to remove the attachment and it would let me, so I just put an icon in there :).

  • Profile Image
    Answered on June 02, 2015 at 12:25 PM


    Apologies for the inconvenience that you are having.

    For testing purposes, I've checked your submissions in the form "BidMail - Online Order Form". I've checked the first submissions, and downloaded the pdf files, unfortunately, I'm unable to get corrupted files. Could you give us a sample submission that we can check, we can investigate it further then. You can just share us the submission dates or the file names on it.

    Have you tried clearing your form's cache and tried downloading the PDF files again?

    We'll wait for your response.

    Thank you.

  • Profile Image
    Answered on June 02, 2015 at 12:43 PM

    Its actually one of my other accounts.  UserID:

    Form# 309002634601271562

    File t1.pdf and t3.pdf if you download them and try to open them they won't open.  Cleared cache and still having that same problem. 

  • Profile Image
    Answered on June 02, 2015 at 02:13 PM

    The number you provided 309002634601271562 must be the Submission ID#... 

    I was able to download both the mentioned PDF files t1.pdf and t3.pdf from the form

     and I was able to see also the issue when I opened the files using my PDF reader.

    The content of the pdf file seems to be corrupt. I am not sure if the file was uploaded as is, or there was a problem during the upload process. 

    The one thing I recommend that you correct is 

    - set "0" to allow unlimited files 

    as it could be the reason or cause of the issue.

    Our recommended number is 25 only for multiple uploaded files simultaneously for every upload session.

    You can check for more details on the user guide:  -Changing-the-Upload-Size-Limit

    As mentioned on the user guide

    JotForm upload max size = 1GB or less per file (use 1048576 value in KB to set the 1GB limit)

    JotForm maximum number of files = Recommended value is up to 25 files per request (submission).

    At this time I think the 2 mentioned files can only be corrected if you were to ask the end-user to re-upload the file again.

    I am sure the file that reached the JotForm server is no different from the files that I was able to properly download.

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