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.
You can do an offline form in Jotform through the fillable PDF form. Unfortunately, the fillable PDF is using our standard non-HTTPS link when submitting so I don't think encryption is enabled there. But in general, Jotform is secure and we take it very seriously.
For more details such as the limitation of the fillable PDF, I recommend checking the following guide:
If you are really concerned about the security, you may consider using the online form version and submit when you are connected to the internet. We have an encryption feature for added security: