Flatten PDF – Flatten PDF Form Fields Free Online

Make filled-in form fields part of the page so they can’t be changed.

Choose PDF file

or drop a PDF here

Your files stay on your device — nothing is uploaded.

Flatten PDF turns the fillable fields of a PDF form — text boxes, check boxes and drop-downs — into normal page content. The answers stay visible but can no longer be changed, which is ideal before sending a completed form.

How to flatten a PDF

  1. Fill in your PDF form and save it.
  2. Click "Choose PDF file" or drag and drop the filled PDF into the box.
  3. Click "Flatten PDF".
  4. Click "Download PDF" to save the flattened copy.

Why use ZentaPDF Flatten PDF?

100% privateFiles are processed in your browser. Nothing is uploaded to any server.
Free, no sign-upNo account, no email, no watermark and no daily limits.
FastNo upload or download wait — results are ready in seconds.
Works everywhereUse it on Windows, Mac, Linux, Android or iPhone in any modern browser.
Original qualityPages are copied as they are — text and images stay crisp.
Large filesHandle big files and many pages — limited only by your device’s memory.

Frequently asked questions

Are my files uploaded to a server?

No. ZentaPDF processes your files inside your own browser using JavaScript. Nothing is uploaded, so nobody else can see your documents — not even us.

Why flatten a PDF form?

So nobody can change the answers after you send it, and so the form looks the same in every PDF reader and when printed.

Does it flatten comments and annotations?

This basic version flattens form fields. Comments and sticky notes are kept as they are.

My PDF has no form fields — what happens?

The tool tells you that no fields were found and saves the PDF unchanged.

Is it really free? Do you add a watermark?

Yes, it is completely free with no sign-up, no watermark and no daily limits. The site is supported by a few non-intrusive ads.

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