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, it is possible to adjust the size of the Captcha textbox. Please insert this CSS code to your form:
height: 40px !important;
You can change the height value if you want. Here's a guide on how to inject custom CSS to your form.
Hope that helps. Thank you.