Jonathan Bowman of Adobe points to a new feature in Adobe Acrobat to quickly remove specific items from a PDF document. This can be quite useful to clean up a file and only keep the original material. To do this, make sure that your PDF document is open in Adobe Acrobat. Go to Document in the top menu bar and select Examine Document. A pop-up window should appear. From there you can check all the items you wish to remove from your file such as hidden text, bookmarks, comments or metadata. Normally, items which are included in your document will appear in this list. Since changes are permanent you better be sure that you really want to get rid of them. You won’t be able to go back afterward. Once the selected items are checked, click the Remove all checked items box at the bottom right of the window. Voila! Your PDF is now clean of those unwanted items!
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