The hidden field feature in Pabbly Form Builder allows for values to be passed along with form entries, without being visible to users.
The process of the hidden field and Prefill key is the same, you can refer to this document:
https://www.formget.com/how-to-pre-fill-form-fields/
This video will demonstrate how to use hidden fields:
Pabbly Form Builder Team•Updated Aug 18, 2026•1 min read