Flattening PDF layers

When you flatten PDF layers, you remove any layers that aren’t visible and consolidate the rest into one layer. You might use this technique if you want to freeze a drawing or project at a certain stage of development in order to archive a non-editable version. To do so, follow these steps:

1. Choose File➪Save As to open the Save As dialog box.
2. Locate a folder destination in the Save In drop-down list and enter a new name for your flattened PDF document in the File Name text box. It is very important that you change the name of this file because flattening the layers in a PDF document cannot be undone.
3. When you’ve saved the PDF file under a new name, click the Layers tab on the Navigation pane and choose Flatten Layers on the Options menu at the top of the Layers palette. A Warning dialog box appears, stating This operation cannot be undone. Would you like to proceed?
4. Click Yes to close the Warning dialog box and flatten the document layers. The proof of your flattening action is exhibited in the Layers palette, which is now completely empty.