Flatten PDF Forms and Annotations
Lock in filled form fields, comments, and annotations by baking them into the page itself. A flattened PDF looks identical everywhere but can no longer be edited in form fields — essential before sharing signed contracts, submitted applications, or reviewed drafts. The flattening is performed entirely on your device with client-side processing, which means sensitive paperwork never travels across the internet.
Choose files ordrag & drop here
.pdf · single file
Processed locally in your browser — your files never leave your device.
How to flatten pdf
- Upload the PDF containing form fields or annotations.
- Click "Flatten PDF" — no configuration is required.
- Download the flattened document with all interactive elements frozen in place.
Frequently asked questions
What does flattening a PDF actually do?
It merges interactive layers — form fields, checkboxes, annotations — into the static page content. The values stay visible but can no longer be changed by anyone.
Why should I flatten a PDF before sending it?
Flattening prevents recipients from altering filled-in values, ensures the document renders identically in every viewer, and avoids empty-field issues in some PDF readers.
Can I undo flattening later?
No, flattening is irreversible for the output file. Keep your original PDF if you might need to edit the form fields again in the future.