Flatten PDF
Lock in your filled-form answers by flattening interactive fields into static page content. The result looks identical but can no longer be edited or accidentally cleared.
Drop your PDF file here
One PDF, up to 100 MB
or click to browse
How to flatten a PDF
Convert interactive form fields into static, non-editable page content.
- 1
Open Flatten PDF
Go to makemypdf.com/flatten-pdf.
- 2
Upload the filled-in PDF
Drop the form-PDF you want to lock. The tool reports how many fields it found.
- 3
Click Flatten
pdf-lib bakes every text box, checkbox, dropdown, and signature field into the page.
- 4
Download the flattened copy
The visible content is identical, but the fields can no longer be edited or accidentally cleared.
Frequently asked questions
Why would I flatten a PDF?
To make sure your filled-in answers can't be changed by someone else, to ensure the form prints exactly as it appears on screen, and to avoid bugs in viewers that render form fields differently.
Does flattening change how the PDF looks?
No. The visible appearance stays the same. Only the underlying interactivity is removed.
Can I un-flatten a PDF later?
No — flattening is one-way. Keep your original interactive copy if you might need to edit fields again.
Is my file uploaded?
No. Flattening runs entirely in your browser via pdf-lib.