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Flattening bakes any filled-in form field values and comment or highlight markup directly into the page as permanent content, then removes the underlying interactive elements — so the PDF looks the same but can't be edited further.
Every filled text field's value is drawn directly onto the page as regular text. Checked checkboxes and radio buttons render as a plain "X". The interactive field is then removed, so the value can no longer be changed.
Each comment or highlight is converted into a small image covering just that region — not the whole page — so the rest of your document's text stays fully selectable and searchable.
Want the full walkthrough? Read our step-by-step guide to flattening a PDF.
Everything you need to know about flattening a PDF
It converts any filled-in form fields and any comments or highlight markup into permanent page content, using each one's own real appearance — a checked checkbox keeps its real check mark, a highlight keeps its real tint — rather than redrawing an approximation. The fields and annotations are then removed, so nothing in the file is still interactive or editable.
No — the visible content stays the same. A filled form still shows the same answers, and a highlighted passage still looks highlighted and still lets you read the text underneath; the only change is that those elements are no longer interactive form fields or editable annotations.
No. Nothing on the page gets converted to an image. Form fields and annotations become permanent page content using their own real appearance, and the rest of the page's real text stays exactly as it was — fully selectable and searchable, unlike tools that flatten by rasterizing the entire page.
Nothing changes — flattening a plain PDF with no fillable fields or annotations is a safe no-op. It's fine to run on any PDF, filled-out or not.
To stop a filled-out form from being altered after the fact — common before emailing a signed application, submitting a filled government form, or archiving a reviewed document with comments. Flattening locks the current state in place.
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