Flatten PDF with UPDF on Mac
Flattening PDFs helps you to change the PDF file into a single layer, preventing other users from copying images, watermarks, signatures, and other important elements in a document.
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To flatten a PDF file, open it on UPDF on your Mac and proceed to the right column to access the menu for Save. With the menu that opens, select the Save as Flatten... option to start flattening the PDF document.

A pop-up window opens on the screen showing different flattening options to select from.
Flatten Forms
If you tend to select Forms, this will flatten the form fields to prevent others from editing the information and make document sharing easier.
Flatten Watermarks
Those who would like to flatten their watermarks can try to check Watermarks option to prevent others from deleting the watermark from the PDF files.
Flatten Cropped Pages
If you have cropped your PDF pages and want to prevent others from accessing and recovering the cropped content, you should use check the Cropped Pages option.
Flatten Comments
When you want to save your added comments from others removing them, you should consider checking the Comments option while flattening.

On selecting any appropriate option according to your condition, click Save As and set the name and location for the flattened PDF on the pop-up that appears next. Click Save to conclude the process.
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