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Unfortunately, it seems like hyperlinks are not functional in the fillable PDF form.
The fillable PDF form converter is still quite a new feature and we appreciate your inputs and feedback on this. I'll forward this to our developers and see if they can do something about it. Unfortunately, because this is a feature request, I'm unable to provide a time frame for this. But we will update you on this thread if we hear any news.
For the meantime, to learn more about the fillable PDF form, please check this guide: http://www.jotform.com/help/312-Fillable-PDF-Everything-you-need-to-know-about-JotForm-Fillable-PDF-Creator.
Apologies for the inconvenience.