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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You can achieve this by adding a textbox field and inserting the URL as a default value there.
1. Add a textbox field and click the gear icon to open the properties wizard.
2. On the properties, select the Advanced tab and insert the URL into the Default Value field.
Save it and you're all set. The url should be visible in the email notification as seen below:
Here's the demo form so you can see it in action: https://form.jotform.com/62920244792963
If you need further assistance, please let us know.