Flatten PDF
Flatten interactive form fields and annotations into static content that cannot be edited.
Examples
See what this tool can do.
Lock a filled form
Flatten a completed form so the answers can't be changed.
Freeze annotations
Bake comments and stamps into the page before sharing.
Tips & tricks
Get the most out of it.
- 1Flatten after filling a form to prevent further edits.
- 2Keep an unflattened copy if you might need to edit later.
- 3Flattening can also help forms print consistently.
About Flatten PDF
What this tool does
Flatten PDF merges interactive form fields and annotations into the page as static content that can no longer be edited.
How to use it
- Upload a PDF with forms or annotations.
- Flatten it.
- Download the flattened PDF.
How it works
Form fields and annotations are rendered into the page content with pdf-lib, so their values become a permanent part of each page.
Important considerations
- Flattening is one-way — fields are no longer fillable afterwards.
Privacy
Your PDF is processed entirely in your browser. The file is never uploaded to a server, which makes this safe for confidential contracts, statements and personal documents.
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Frequently asked questions
No. Flattening is permanent — the fields become static content. Keep an original if you need to edit again.