Flatten PDF
Lock filled form fields, comments and stamps into the page so they cannot be changed.
Free · No app needed · Works in your phone browserYour files are processed in this browser and never uploaded.
How to use Flatten PDF
- Select your PDF.
- Choose what to flatten.
- Download the locked PDF.
Questions about Flatten PDF
What is the difference between the two modes?
"Form fields only" keeps the text selectable and only locks the form answers. "Everything" turns each page into an image, so comments, stamps and drawings are locked too.