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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You can increase the upload size limit on your form, just refer to this guide in order to know how to do it : http://www.jotform.com/help/33-Changing-the-Upload-Size-Limit
Do note, this uploaded files will use the free space in your account, you may get the Almost Out of Space message, if you got it, just delete old submissions or you will need to upgrade your account.
Hope this helps.