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Flatten PDF

Merge forms and annotations into the page so they can no longer be edited.

3 free files a day · No sign-up · No ads

Frequently asked questions

How do I use Flatten PDF online?

Upload your PDF file, adjust the options if you need to and press Run. PDFMaster processes the file on our servers and gives you the PDF result to download in seconds, with no software to install.

Is Flatten PDF free?

Yes. You can use Flatten PDF online for free with 3 files a day, renewed daily, with no account and no ads. Premium removes the daily limit.

Is my document safe?

Files travel over HTTPS and are kept only for the time needed to finish the job. Nothing is shared with third parties and you can delete the output as soon as you have downloaded it.

Guide and use cases

Flatten PDF: Guide and use cases

Flatten a PDF to merge form fields, annotations and signatures into the page content so they can no longer be edited. The result looks identical in every viewer.

How it works

  1. Upload the PDF with forms or comments.
  2. Click Flatten.
  3. Wait for the fields to be rendered into the pages.
  4. Download the flattened, read-only document.

Use cases

Tips