Flatten PDF
Make form fields and comments part of the page so the PDF can’t be edited by mistake. Free, and it runs on your device.
Flatten PDF turns filled-in form fields, comments, highlights and stamps into ordinary page content, drawn exactly as they look now. Nobody can change the answers or delete the comments afterwards, and the PDF prints and displays the same in every reader. Choose to flatten form fields, comments, or both. Links keep working, and fields with no saved look are left as they are and counted.
How to use Flatten PDF
- 1
Add your PDF
Drop or choose a PDF with filled form fields or comments.
- 2
Choose what to flatten
Form fields, comments and stamps, or both.
- 3
Download
Save the flattened PDF.
What it does
- Exactly as it looks
- Each field and comment is drawn from its saved appearance.
- Links still work
- Only fields and comments are flattened.
- Text stays text
- Typed answers remain searchable and selectable.
Questions
Why flatten a PDF?
So the filled-in answers and comments can’t be changed or removed, and the file looks the same in every PDF reader and when printed.
Can I undo flattening?
Not in the flattened file. Keep the original if you may need to edit the form again.
What about a digitally signed PDF?
Any change to a signed file means the signature no longer validates. Flatten before signing, not after.
Is my PDF uploaded?
No. It’s processed on your device and never leaves it.