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 put a background image in your form through the Form Designer.
1. Click the Form Designer button in the toolbar.
2. Under the Design tab, you should see "Background Image". You can add background image by uploading an image and use option "Fixed" so the image will stay on even if you scroll it.
Hope this helps. Let us know if you need further assistance. Thank you.