Flatten PDF Forms Online
Lock in your answers — turn form fields into permanent page content.
Select Or Drag & Drop PDF Here
No settings needed — just upload a filled-in PDF form.
Working…
✅ Done!
❌ Error
Filled in a PDF form and want to make sure nobody can change your answers? PDF Boy's Flatten PDF tool bakes every fillable field — text boxes, checkboxes, dropdowns — into the page itself, so the form can no longer be edited.
How to use Flatten PDF
- Select your filled-in PDF form.
- Click Flatten PDF.
- Download the flattened, uneditable PDF.
Frequently Asked Questions
What does flattening a PDF do?
It converts interactive form fields into ordinary page content, so the filled-in values can’t be edited any more.
Why does it say no form fields were found?
The PDF doesn’t contain fillable fields (it may already be flat, or be a scan), so there’s nothing to flatten.
Does flattening change how the PDF looks?
No. The page looks the same; only the ability to edit the fields is removed.
Is the Flatten PDF tool free and unlimited?
Yes. PDF Boy's Flatten PDF tool is completely free, with no signup, no watermark and no limit on how many files you process.
Are my files uploaded to a server?
No. Everything happens locally in your browser, so your files never leave your device.