Will I still be able to edit the fields after flattening?

No, that is the point: once flattened, the fields and annotations become part of the page and are no longer editable interactive elements.

Why does my form appear empty for some recipients?

Some readers handle interactive fields poorly. Flattening the PDF bakes the values into the page, guaranteeing an identical display everywhere.

Does flattening degrade the quality of the pages?

No. The existing content is preserved; only the fields and annotations are embedded, with no visible re-encoding of the rest of the page.

Are my files uploaded to a server?

No. All processing happens in your browser: your files never leave your device.

Flatten PDF

Lock form fields and annotations into the document's pages.

To flatten a PDF, import a filled form: the tool merges the form fields directly into the pages, making the content fixed and read-only. Everything runs in your browser: the file is never uploaded to a server.

100% local processing
100% free
No sign-up

Loading the tool…

How to

Import your filled PDF form.
The tool merges the form fields into the pages.
Download the flattened PDF, ready to share.

Features

Fixed form fields

The values typed into fields become an integral part of the page. The recipient sees exactly what you filled in, with no way to change it by accident.

Non-editable result

After flattening, the fields are no longer interactive: no one can clear or alter the values entered, which locks the form once it has been filled in.

Identical display everywhere

A flattened PDF looks the same in every reader, mobile included. No more forms that appear empty or distorted depending on the app used to open them.

Preparation before sharing

Flattening a form before sending visually locks its content and simplifies its structure, reducing the risk of accidental changes during transmission or printing.

Use cases

Lock a completed admin form before sending it back.
Fix a signature or initials placed on a contract.
Ensure a quote displays identically on the client's side.
Prevent accidental edits to the fields of a shared invoice.

Your files never leave your device

Unlike most online PDF tools that upload your files to their servers, all processing happens right here, in your browser. No document is ever sent, stored or analyzed remotely: it's free, no sign-up, and private by design.

Frequently asked questions

Will I still be able to edit the fields after flattening?: No, that is the point: once flattened, the fields and annotations become part of the page and are no longer editable interactive elements.
Why does my form appear empty for some recipients?: Some readers handle interactive fields poorly. Flattening the PDF bakes the values into the page, guaranteeing an identical display everywhere.
Does flattening degrade the quality of the pages?: No. The existing content is preserved; only the fields and annotations are embedded, with no visible re-encoding of the rest of the page.
Are my files uploaded to a server?: No. All processing happens in your browser: your files never leave your device.