How to Flatten a PDF Free — Lock Forms, Signatures and Annotations
Flattening merges form fields, signatures and annotations into the page itself, so they can no longer be changed. It is the last step before sending a filled form or a signed document.
RightPDFKit's Flatten PDF tool does this in your browser, with no upload.
Step by step
- Fill in or sign your PDF first.
- Open rightpdfkit.com and choose Flatten PDF.
- Upload the completed file.
- Click Flatten.
- Download the flattened PDF and check it looks right before sending.
Why flatten a PDF
A flattened PDF shows the same content on every device and can't have its answers changed. It also fixes forms that display blank fields in some viewers.
What flattening does not do
Flattening is not security. The text can still be copied. To restrict opening, use password protection, and for permanent removal of sensitive text use redaction.
Keep a copy
Flattening can't be undone, so save the editable version before you flatten it.
Frequently asked questions
Can I undo flattening?
No. Keep an unflattened copy.
Does flattening reduce file size?
Sometimes, because form data is merged into the page.
Is flattening the same as redaction?
No. Redaction removes content. Flattening only locks it in place.
Is my file uploaded?
No. Flattening runs locally in your browser.
Is it free?
Yes, all tools are free with no account.