📐 Flatten PDF

Merges all interactive form fields, annotations, and comments permanently into the page content layer. Once flattened, fields can no longer be edited or filled — the values become static content. This is useful before sending a finalised form, printing, or archiving a document. Processing is handled server-side by Ghostscript. The operation is irreversible; always keep a copy of the original if you may need to edit the form again.

Flattening merges interactive elements into the page content permanently. Form fields, annotations, and layers selected for flattening cannot be recovered. Keep the original file as a backup.