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.
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.