Open Microsoft Word and create or open the document you want to turn into a fillable PDF
Go to File > Options > Customize Ribbon
Check the Developer box and click OK
Use the Developer tab to insert form fields such as text boxes, check boxes, and drop-down lists
Add labels and spacing where users will enter information
Save the document as a Word file first
Go to File > Save As
Choose PDF as the file type
Select the option to keep the document structure and click Save
Open the PDF in a PDF editor if you need to verify or adjust the fillable fields
Test the PDF by clicking each field to make sure it is editable