Adobe keeps changing my document size and margins

@nancip When you "print to PDF," in WOrd, you're essentially telling your computer's print driver to render the document as a PDF. This driver often has default settings for scaling, margins, and paper handling that might override your original document's precise layout. In your case, I would prepare your second half PDF by making sure you have the second half of your flip book as a separate PDF file, with pages in the correct reverse order. Open the second half PDF in Adobe Acrobat Pro. Go to "Organize Pages" Tool: In the right-hand pane, look for the "Organize Pages" tool. If you don't see it, go to Tools > Organize Pages. 

You should see your thumbnails of your pages. Select all the pages in the second half of your document. In the toolbar above the thumbnails (or by right-clicking the selected pages), you'll see rotation icons. Click the "Rotate Counterclockwise" or "Rotate Clockwise" icon twice (180 degrees) to make them upside down. Important: This rotation is applied directly to the page content and is saved when you save the PDF. Now, save the modified PDF under a different name. Go to File > Save or File > Save As to save this rotated PDF. This will permanently embed the upside-down orientation into the PDF itself, without changing margins or scaling.

Hi @nancip,

Hope you are doing well. Thanks for writing in!

Before merging the documents, can you check if the second document that needs to be reversed and upside down is already in the same state?

This can ensure a smoother merger of the files without any changes being made to the final document.

Another way is to flip the required pages in the document. Then, could you try closing the document in Acrobat (not the application but the document)? This will trigger a save dialog box.

Let us know how it goes.