Click Merge to combine all your documents into one. 2. Remove all Adobe Flash, Java, Acrobat and other plugins from a PDF (for use with Windows 7/8/10) Remove Flash plug-ins from the PDF document by right-clicking and choosing “Unblock Plugins” in the context menu. For Windows Vista, open the “Control Panel” application and select “Add or Remove Programs” from the window that pops up. Click the Add or Remove Program button next to Adobe Flash Player. In Windows 7, the Add or Remove Programs application will be located in Start ▸ Control Panel. Right-click on the “Adobe Flash Player” entry in the list of programs and then select “Uninstall”, then click “Yes” to proceed with the removal of Adobe Flash. Adobe Reader and Photoshop: Uninstall/Change Adobe Reader (or Adobe Photoshop) If you don't trust Adobe Reader, Photoshop, Flash, Adobe Acrobat, Reader Extended, or Acrobat Reader Extended, you don't have to uninstall them. It's a common misconception that you must uninstall them to avoid issues with PDF conversion — there is no need to uninstall Adobe Reader or Adobe Photoshop, but you could, if any of the following are happening. The PDF file is corrupted. For some reason, the PDF file is corrupted to the point where Adobe Reader doesn't read it properly. In some cases, it will also not open. Note : To help ensure that a PDF file is readable by any version of Adobe Reader, make sure you: Choose a compatible PDF viewer for the PDF file. Right click it, then choose “Read Only, Viewed Version” to ensure that it is no longer displayed (but Adobe Reader still runs, it's just displaying the read-only options). To help ensure that a PDF file is readable by any version of Adobe Reader, make sure you: Adobe Reader: The files are large. You should make sure that the size of the PDF file does not exceed 100 MB. For most Adobe PDF files, there is a way to save a version that only requires Adobe Reader 8.0. You can learn how to change Adobe Reader's settings on Windows by opening its “Help” window using the “View” menu.