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.
To clarify, what you meant by "document" is the form? Is that correct?
If you would like to make it secure, you can enable the SSL submissions. Here's a guide to learn more about it: http://www.jotform.com/help/63-How-can-I-receive-SSL-Submissions.
However, please do take note that for "Free" plan, SSL submissions are limited to 10 per month. You can check the limits of each plan in our pricing page.
We also have a new feature, the Encrypted Forms, you can learn more about it in these guides:
Do let us know if this is what you have in mind when you mentioned secure.