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Flatten PDF

Lock filled form fields and make them permanent. Flatten a PDF so its values can no longer be edited, all processed on your device.

Drop a PDF to flatten
Processed in your browser. No upload
No upload · processed locally · auto-deleted
A · Keep going

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B · How it works

How to flatten a PDF form for free

Drop a filled PDF form and FernPDF flattens its fields into permanent page content, then downloads the locked copy. The values become part of the page and can no longer be edited.

Flattening runs entirely in your browser, so completed forms with personal details are never uploaded to a server.

C · FAQ

It bakes interactive form fields into the page as static content. The filled-in values stay visible but can no longer be changed or cleared.

Before sharing a completed form, so the recipient sees your answers exactly as filled and can't accidentally (or deliberately) edit them.

No. Flattening happens in your browser and the file downloads directly. Nothing leaves your device.