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.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
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.
Thank you for contacting us.
I do not think that we have expandable text boxes, but you can increase the size of text boxes via editor (or their width via Form Designer).
Also, there is a Text Area field type available on which you can adjust number of columns and rows.
If you need any further assistance, please let us know.