Flatten PDF form

Lock filled form fields so they can no longer be edited.

100% in your browser Truly free — no sign-up, no card, no subscription.

Drop a PDF here or click to choose

Locks fillable fields (AcroForm) into the page so they can no longer be edited.

How it works

Flatten a fillable PDF so its form fields (text, checkboxes, dropdowns) become part of the page and can no longer be edited or cleared. Useful before sharing a completed form. Everything runs in your browser: the file is never uploaded.

Frequently asked questions

What does flattening do?

It bakes the current field values into the page so they display everywhere and can no longer be changed as form fields.

What if the PDF has no form fields?

There is nothing to flatten — the tool tells you and leaves the file unchanged.