Make sure that the security settings allow form filling. (See File > Properties > Security.) Make sure that the PDF includes interactive, or fillable, form fields. Sometimes form creators forget to convert their PDFs to interactive forms, or they intentionally design a form you can only fill in by hand.
Place the mouse where you want to put the fill-in form field. Click the "Developer" tab, then select "Design Mode." Then, click the "Content Control" buttons to insert content controls like drop-down menus or a date picker. Click the "Design Mode" button again when you're finished to activate the form.
To convert a PDF to fillable online, upload your document to . online editor instantly converts any PDF document to a fillable format online. You can fill your PDF with our various tools and features. To fill the form with text, choose the 'Text' button and start typing.