This post helps to add a text box to PDF using a free software and an online tool. You can adjust the size of text box, text style, etc.

LibreOffice Writer can create fillable PDFs from scratch with built-in tools. Start by opening a blank document and adding form fields using the Form Controls and Form Design toolbars. To export as an ...

How to Edit Text in Adobe Forms. In most cases, Adobe PDF files contain static data, not intended for other users to edit. PDF forms, however, can have editable text boxes, allowing you to fill ...