Flattening a PDF merges all form fields, annotations, and comments into the base content so they can no longer be edited. The visual appearance stays identical.
Use this before sending a completed form to ensure nobody can alter your entries, or to reduce file size by eliminating interactive elements. It's also handy when a printer has trouble with layered PDFs.
It merges form fields, annotations, and layers into the page content. The result is a static document that looks the same everywhere.
Common reasons: locking filled form data, preventing edits, fixing display issues in certain viewers, or preparing for print.
No. Flattening is irreversible. Keep a copy of the original if you might need to edit form fields or annotations later.