Preview your PDF: Click Preview to preview your merged file. If you notice any errors, correct them by clicking the check mark next to the file. Â To delete a merged file, highlight the file in any area of the document and click Delete.5. Close Acrobat DC: Double-click the merged PDF to save it. How to Merge or Combine Multiple PDF Documents Into One File | Adobe Acrobat Select the files to merge into the original PDF, then click the 'Add' button: In order to work on multiple documents at the same time, first select several files in Windows Explorer and then create an Adobe Acrobat file including all the selected files. (Use the context menu to do this). Â Click the 'Add Files' button to add some or all of the files to the Acrobat document. The Acrobat plugin can automatically detect the files to include into the PDF file. How to merge or combine multiple PDF files Create a separate Adobe Acrobat file. Choose any number of files from Windows Explorer and add them by placing them in an Adobe Acrobat document by clicking the 'Add' button. These files should be selected by the Acrobat plugin (as opposed to manually selecting them). The plugin will then automatically detect which files will be added into the PDF file and include them. When a new PDF document is opened, the new files are automatically added. To view your PDF file in Acrobat DC, you will have to first create a separate PDF document from the contents of the original PDF document. How to Merge or Combine Multiple PDF Documents Into One File | Adobe Acrobat Why do I need Adobe Acrobat DC to merge PDF files? To create your PDF files, first select a number of files and then choose the 'Add' button. This will create a separate copy of each of your files that, in the case of combined files, will appear as two PDF files. Note: When printing merged PDF files, the printer will be presented with two PDF documents. How do I remove some content from a PDF file? To remove specific parts of a PDF file, click on the 'X' mark next to the content. When you do this, you will be able to view the removal options that Adobe Acrobat provides. The 'X' mark is located in the top right corner of each section of your PDF file. The removal options are as follows: Compressing file to make it smaller.