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.
There are several captchas that you can add to your JotForm.
You can see 3 of them in action on JotForm here: http://form.jotformpro.com/form/42593404965967
Now you can use the link and clone them to your own JotForm, but to add them yourself to the JotForm you can find them here:
Go to quick tools
Now you will see captcha widget, so you can add it to your JotForm
If you want to find some more interesting or unique captchas then you can click on the Widgets (right under the Quick tools and in the same menu) and search for captcha
This is how they look on the form to your users:
If you have any trouble adding the captcha widgets to your JotForm do take a look at this easy to follow tutorial here: http://www.jotform.com/help/252-How-to-Add-a-Widget-to-your-Form
I hope that this helps you and do let us know if we can help you with anything else.