How to Flatten a PDF Free — Lock Forms and Annotations

What Does Flattening a PDF Do?

Flattening converts interactive elements — form fields, annotations, signatures, comments — into static content permanently baked into the page. After flattening, nobody can modify, move, or delete those elements. The PDF becomes a flat image-like document.

When to Flatten PDFs

• After signing — lock your signature so it cannot be moved or removed
• Before sharing filled forms — prevent recipients from changing your responses
• For printing — ensures what you see is exactly what prints
• For archiving — creates a permanent record of the document state

How to Flatten a PDF

1. Open the Flatten PDF tool
2. Upload your PDF with form fields, annotations, or signatures
3. The tool flattens all interactive elements
4. Download the flattened PDF