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 look at your form settings for uploading files by going to form builder and clicking on File upload part of your form.
1. Click on File upload.
2. Click on Max File Size and change value that suites you. Default value for Max File Size is 1MB(1024 KB) maximum value you can set is 1GB (1048576 KB).
You have to increase this value to be larger than your users image size and it should solve your problem.
Please let me know if this works for you.