Sejda PDF

Flatten PDF

Turn fields and annotations into fixed page content.

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Supported: PDF

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About Flatten PDF

Flattening bakes form entries, signatures, highlights and comments into the page itself. The result looks the same everywhere and can no longer be edited or accidentally cleared.

  • Prevents accidental edits
  • Consistent look in every reader
  • Often reduces file size

How to flatten pdf

  1. 1

    Upload the filled document

    Forms, notes and stamps included.

  2. 2

    Choose what to flatten

    Form fields, annotations, or both.

  3. 3

    Download

    A print-and-scan result, without the print and the scan.

A practical guide to flatten pdf

When a document should be flattened

Flatten a PDF right before you send or archive it, especially a completed form, a signed agreement, or a marked-up draft you want to preserve as a record. It is the answer to the common problem of form answers or signatures showing up in one program but vanishing in another, or of a recipient accidentally clearing a field. Flattening also locks annotations so a reviewer cannot quietly move or delete a comment. If a document is final and its current appearance is what matters, flattening guarantees that everyone sees exactly the same thing.

Deciding what to flatten and what to keep

The most common mistake is flattening the only copy you have and then needing to change an answer, because flattening cannot be undone. Always keep the fillable original before you commit. Use the selective options to your advantage: flatten form fields and annotations to freeze the content, but keep link annotations if the document relies on clickable navigation or references. If you are still collecting input, do not flatten yet, since a flattened field can no longer be typed into. Treat flattening as the step that says the document is done.

Pairing flatten with other finishing tasks

Flattening sits naturally at the end of a document's life. Fill the form or add your signature first, then flatten to make those entries permanent, and consider adding a password afterward if the finished file is confidential. Because flattening merges layers into simple page content, it often trims file size as a bonus, though you can still run compression if the document is image heavy. If you need an unchangeable archive record, flattening followed by clearing sensitive metadata gives you a clean, self-contained file that looks the same in every reader you or your recipients might use.

Frequently asked questions

What exactly gets baked into the page when I flatten?
Flattening converts live elements into fixed page content: filled form fields, signature images, highlights, stamps and comment markup all become part of the page graphics. You choose whether to flatten form fields, annotations, or both. Afterward those items look identical but can no longer be clicked, edited or cleared.
Will a filled form still show my answers after flattening?
Yes, and that is the main reason to do it. Some readers display form entries only in their own software and can render them differently or drop them when printing. Flattening writes the entered values straight onto the page so every reader, printer and preview shows the same completed document.
Can I flatten but keep my hyperlinks working?
Yes. Link annotations can be preserved as a separate option, so a flattened file can still have clickable links even though form fields and comments have been fixed in place. Everything else you chose to flatten becomes static page content.
What happens to my file after I flatten it?
The document is processed for the session and then deleted automatically, no sign-up is required, and your fillable original is never modified on your device. The flattened result is a fresh download that opens and prints consistently in any reader.

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