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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To encrypt your existing form, just follow the instructions below:
1. In Form Builder, Click Preferences.
2. Click Advance Settings.
3. Set Encrypt Form Data to Yes,
4. Then you will get a new dialog that will ask you to add your own public key or to have one generated for you.
For more information you can check this guide: What are Encrypted Forms and how to use them as expert.
Do let us know if you need further assistance.