JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
The width of the form can be adjusted by following the instructions from this guide: https://www.jotform.com/help/35-The-Importance-of-Form-Widths.
The height of the form is automatic based on the number of fields in your form, but you can control this by getting your form iFrame codes: https://www.jotform.com/help/148-Getting-the-Form-iFrame-Code. In the iFrame codes, adjust the height value: