What image size can I use for form background?

Olhando aqui não aparecem as dimensões.

Hi joaorios,

Thanks for reaching out to Jotform Support. Unfortunately, our Portuguese Support agents are busy helping other Jotform users at the moment. I'll try to help you in English using Google Translate, but you can reply in whichever language you feel comfortable using. Or, if you'd rather have support in Portuguese, let us know and we can have them do that. But, keep in mind that you'd have to wait until they're available again.

Now, coming back to your question, the image dimension should depend on your primary use case for the form. However, to be safe it is recommended you should provide a background Image at least 1920 X 1080 px to display in full resolution for most modern desktops. Alternatively, you can use a smaller image as a repeating background.

Let us know if there’s anything else we can help you with. 

ok, obrigado.