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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As I understood, you want to add custom unique number to your Form Submissions. You can set this with our new "Unique ID" field.
Search "Unique ID" at "More Fields" and add it to your form.
Then click the field. You can customize this number as you can see below:
If you have any questions, feel free contact us.