Delete or replace a page
You can replace one or more pages in the document with a selection of pages from another document. Text, images, links, and comments on the original pages are all replaced, whereas bookmarks and interactive elements associated with the original pages are not affected.
You can remove a selection of pages from a PDF document. The Delete command cannot be undone, so make sure you want to delete the selected pages before clicking OK.
To replace pages
Replace pages using the Replace command:
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Open the PDF file that contains the pages you want to replace and choose Document > Pages > Replace
.
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In the Open dialog, select the document containing the replacement pages and click Open.
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In the Original section of the Replace Page dialog box, enter the pages to be replaced (A) in the original document.
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In the Select Source Pages section, specify the replacement page range (B). Click OK.

To delete pages
Delete pages using the Delete command
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Open a PDF file and choose Document > Pages > Delete
.
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In the Delete Pages dialog box, define the page range to be deleted. Click OK.
Delete pages using the Page Thumbnails
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On the Sidebar Navigation pane, click the Page Thumbnails icon
to open the Page Thumbnails panel.
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In the Page Thumbnails panel, select the page or Ctrl-click to select multiple pages to delete.
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In the Page Thumbnails toolbar, click the Pages Panel Option button
and select Delete….
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In the Delete Pages dialog box, the page range is already displayed in the Selected field. Click OK.
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Make sure you want to delete the selected pages. Click OK.
Note: you cannot delete all pages because at least one page must remain in the document.