Turn filled-in form fields, comments and signatures into a fixed part of the page that cannot be edited.
After you fill in a form or add comments, those elements remain an editable layer and may disappear or change in some programs. Flattening merges them into the page content, so the file looks the same everywhere and the recipient cannot change the values.
Turn filled-in form fields, comments and signatures into a fixed part of the page that cannot be edited.