How do you fill a PDF from data?
Definition
Filling a PDF from data is the process of writing values into a fillable PDF's fields programmatically — from a database row, an API payload, or a document — instead of typing them by hand. It matches each value to the right field and sets it.
What it requires
The PDF must be fillable: it needs real fields with names that values can be matched to. Given that, a program can map each piece of data to its field and write the values in, producing a completed document without manual entry.
From source to finished form
The data can come from anywhere: a CRM record, a form submission, the text of another document. The work is matching each value to the correct field and handling the form's logic, then writing a finished PDF that reads back as clean data.