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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It is possible to put those images on one line. In the Form Builder the IMG tool has a container that it is displayed in. When clicked on this container has a cog icon that can be clicked to adjust its settings. In this settings menu there is an option for Shrink or Expand depending on whether it is currently shrunk or expanded. You can use the shrink option to make the containers around these images smaller and drag and drop them into place next to each other.
When the image containers have been shrunk to the size of the image inside of them they can be stacked to achieve the layout shown in the picture below.
I also created an example form for you to look at and see it live in your browser that can be accessed here. http://form.jotform.me/form/51256206897462?
Hope this helps. Feel free to respond if you have any more questions.