Flatten PDF
Lock form fields and layers into the page.
Runs on your device. Files are never uploaded.
Form fields become ordinary page content, so filled answers cannot be changed and the document looks identical in every viewer. Full flatten also merges comments and stamps.
About Flatten PDF
Form fields become ordinary page content, so filled answers cannot be changed and the document looks identical in every viewer. Full flatten also merges comments and stamps.
How to use Flatten PDF
- Add a PDF.
- Choose form-only or full flatten.
- Download the flattened PDF.
Questions
What is the difference between the two modes?
Form-only keeps text selectable and flattens just fields. Full flatten renders each page as an image, merging everything, including comments.
Are my files uploaded to a server?
No. The tool runs in your browser using your own device. Your file is never sent to us or anyone else — you can even disconnect from the internet after the page loads.
Is it really free?
Yes. There is no account, no watermark and no daily limit.
Is there a file size limit?
There is no fixed limit. Very large files depend on your device memory — a modern phone or laptop handles files of several hundred MB.