What is JotForm?
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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Yes you may use Hebrew and lots of other languages to localize your forms.
Complete guide: How-to-Make-your-Forms-Multilingual
What I'd recommend is for you to start building your form first > add the translations > then use CSS to make them them appear in RTL.
To make a DOM element rendered in RTL, you may use this CSS:
External reference: https://www.w3schools.com/cssref/pr_text_direction.asp
Related guide: How-to-Inject-Custom-CSS-Codes
Give it a whirl and don't hesitate to get back to us if you need more help.
I really like your system and would love to move all my activity to you guys.
I got the translation part, but still the whole system isn't set as RTL.
Do you have some custom code that I can use that set the whole form into RTL?
Since you haven't mentioned which form you're currently working on, I used this one as an example http://www.jotform.me/form/70453598625465
The labels on that form doesn't appear to be rendered in RTL direction so to change that, use the following CSS:
text-align: right !important;
Complete guide: How-to-Inject-Custom-CSS-Codes