Flatten PDF online
Flatten forms and annotations in PDF
This tool lets you flatten pdf files so layers, form fields, and annotations become part of the page. It is useful before sharing, printing, or archiving a document. If you need flatten pdf or pdf flatten online, you can do it here without extra steps.
How it works
Upload the PDF
Choose a PDF with fillable fields, annotations, signatures, or layers that should become fixed.
Flatten visible content
The tool saves form values and marks into the page appearance so they display consistently.
Download the flattened PDF
Open the output in a different PDF viewer to confirm fields and annotations still appear.
Frequently asked questions
About Flatten PDF
Flatten PDF turns interactive or layered content into a simpler visible PDF. It is useful when form fields disappear in another viewer, comments move around, signatures need to appear consistently, or an upload portal rejects interactive PDFs. Flattening is common before sending filled forms, signed approvals, annotated proofs, and documents that must look the same in every viewer. It reduces surprises because the receiver sees the filled values and marks as page content instead of editable layers. Keep an editable original before flattening. Once a form field or annotation is flattened, it is much harder to change cleanly.
Updated June 2026: Added guidance for flattening forms, annotations, signatures, browser compatibility, and preserving a separate editable original.