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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I'm not really sure what you meant, could you please provide us more information about this?
JotForm form's CSS and JS files are hosts in our servers. If you insert your own custom CSS code using the form builder, then it will stay in our end.
We recommend using the generated script and iframe embed codes in our end so that changes made on the form using the form builder will easily reflect in the live form.
I hope that helps.