Flatten a PDF
Open a PDF with a form and flatten it — filled fields become part of the page and can no longer be changed. All in your browser.
How it works
- Open a PDF with a filled-in form.
- Click “Flatten” — form fields become part of the page.
- Save the PDF — the values can no longer be edited.
Frequently asked questions
What does flattening do?
It bakes form fields into the page content: the values stay visible but can no longer be changed or cleared.
Why flatten a PDF?
To lock a filled-in form before sending it — so the recipient can't accidentally or deliberately change the entered data.