Flatten PDF

100% Private: Your files are never stored on our servers — they are deleted immediately after processing.

Make your PDF un-editable the right way. Flattening bakes form fields, annotations, comments and stamps into the page content itself — so nobody can change the values or delete your notes. Ideal for finalized contracts and submitted forms.

How to Flatten a PDF online

  1. 1

    Upload the PDF with form fields or annotations.

  2. 2

    Click Flatten PDF — interactive elements become fixed page content.

  3. 3

    Wait a few seconds for processing.

  4. 4

    Download the flattened, share-safe PDF.

Why use Flatten PDF on impdf.app?

Forms become permanent

Filled-in values stop being editable fields and become part of the page itself.

Annotations locked in

Comments, highlights, stamps and drawings are merged into the document content.

Share with confidence

Flattened PDFs display identically everywhere and can't be accidentally altered.

Print-perfect

What you see is what prints — no missing form values or disappearing annotations.

Frequently Asked Questions

What does flattening a PDF do?

It converts interactive elements (form fields, annotations, comments) into fixed page content that can no longer be edited or deleted.

Can I un-flatten a PDF?

No — flattening is permanent. Keep the original interactive file as a backup before flattening.

When should I flatten?

Before sending finalized contracts, submitted forms or signed documents where fields must stay exactly as filled.

Does flattening change the appearance?

No — the document looks identical; only the editability changes.